介词习题及答案(含解析)

基础题

1. ___ now on, I will learn English in the mornings. A. Since B. From C. After D. At

2. They are doing much better ___ Math ___ the help of their teacher. A. in;with B. in;at B. with;with D. on;at 3. South Korea is ___ the east of China. A. in B. to C. on D. at

4. The pupils will go to the museum ___ foot and come back ___ bus. A. by;in B. on;by C. on;on D. by;by

5. —There are so many cars on the road. You should obey the traffic rules and go ___the zebra.

—OK. I will follow your advice.

A. cross B. across C. through D, around

6. —There is a large beautiful bridge ___ the river in this town A. over B. on C. under D. beneath

7. Kate is not good ___ English but she does very well __ Biology. A. in;at B. at;in C.on;in D. on;at

8. It was very silly ___ you to take in what he said. He is a liar! A. for B. to D. of D. with 9. He suddenly return ___ a stormy night. A. in B. during C. at D. on 10. __________! There comes a train!

A. Look out B. Look around C. Look forward D. Look on

11. The car runs ___ a very high speed and directly hits the tree beside the street. A. on B. with C. at D. in

12. The old man ___ a blue sweater is our new headmaster. A. with B. in C. on D. into

13. ___ the beginning of the meeting, the president made a speech ___ how to reduce pollution.

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A. at;in B.at;on C. in;on D. on;on 14. This beautiful skirt ____________ of cotton.

A. is made from B is made of C. makes from D. makes of 15. This problem is so tough that they can’t find the ____. A. way B. way out C. way off D. way in 16. ________! Said the teacher angrily.

A. Shut down B. Shut out C. Shut in D. Shut up 17—Did Sam go to the cinema yesterday？ —Yes, we all went there ____ him.

A. except for B. beside C. besides D. except 18. He is sitting _______ the room that is _________ the old tree. A. in the front of/in the front of B. in front of/in the front of C. in front of/in front of D. in the front of/in front of 19. The doctor told me to take this medicine ____. A. in time B. on time C. at times D. by the time 20. The little girl made money ___ selling flowers. A. in B. on C. with D. by

21. Our Chinese like eating moon cake ____ Mid-autumn Day. A. in B. at C. on D. during

22. Would you mind not picking up the flowers in the garden? They are ____ everyone’s enjoyment

A. to B. for C. at D. in

23. I get up early ____ the morning, but ___ Sunday morning I get up very late. A. on;in B. in;on C. in;in D. on;on 24. The plane arrived at London airport ______ Wednesday. A. on B. at C. in D. for 25. What do you usually do ________ Christmas? A. on B. at C. in D. for

26. Mrs. Brown worded in the west of Australia ________ last summer. A. / B. on C. in D. since

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27. The first class begins _______ 8 o’clock ______ the morning. A. at/on B. at/in C. on /in D. on/on

28. _______the past two months he has been busy with his school work. A. For B. On C. Since D. At

29. ________last Saturday, we had had two football matches with Class Two. A. For B. / C. By D. During 30. We will be in Nanjing _____ Tuesday ______Thursday. A. on/ through B. on/to C. from/to D. on./till 31. Mr Black will visit our new school building ______ two days. A. before B. after C. at D. in

32. _______ the end of last spring Wang Hai joined the army _______ the end. A. At/at B. By/in C. In /at D. At /in 33. We will have a football match _____ this Saturday afternoon.. A. on B. / C. in D. for 34. He came to see you _____ the evening of May 10th. A. in B. at C. on D. for 35. I’m afraid I gave you a lot of trouble ________ my stay here. A. in B. for C. during D. on

36. The singing group will have two performances ______ October. A. after B. since C. / D. for 37. The supermarket is open ______ midnight. A. at B. on C. till D. /

38. She didn’t go to work ______ that morning. She slept ______ noon. A. /…till B. on…till C. at…at D. /…at

39. He was ill _____ a week, and _______ the week he ate almost nothing . A. for/at B. for/during C. during/during D. for/for 40. Days are longer ______ summer than ___________ winter. A. in/in B. in/on C. from/to D. to/in 41. Tom and Paul usually watch TV ______ weekends. A. at B. in C. for D. /

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42. Every day the old man takes these children home _____ school. A. at B. to C. from D. after 43. Could you come to my office ________ the day after tomorrow. A./ B. on C. in D. at

44. We had built three bridges over the river _______ the end of 1994. A. at B. on C. for D. by 45. Life will be better _____ the 21st century.

A. at B. on C. for D. in 46. Do you often work late _____ night.

A. at B. in C. for D. during 47. — Jimmy your toys should be in right order. --- OK. I’ll get ___ them ___ right now.

A. put;down B. put;away C. put;up D. put;on

48. We are going to ___ with some friends for a picnic this weekend. Would you like to

come?

A. get on B. get way C. get along D. get together 49. My aunt has worked in a clinic ___ 1949. A. after B. before C. all D. since 50. When did you get ___?

A. home B. to home C. at home D. the home 51. This sewing machine is made ___ China. A. of B. on C. in D. from

52. I don’t think you can finish the work ____ my help. A. since B. because C. without D. unless 53. —How long has this bookshop been in business?

—_______ 1982

A. After B. In C. From D. Since 54. .—What are you doing?

— I’m looking ___ the children. They should be back for lunch. A. after B. at C. for D. up

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55. The teacher told the class to ____ their books. A. put away B. put by C. put on D. put up 56. They are going to have a crazy party ___ Christmas Eve. A. at B. in C. on D. during

57. Let’s walk over ____ the sun on the other side of street. A. in B. to C. under D. by

58. —What do you want to do ____ those old boxes? — To put things in when I move to the new flat(一套房间). A. by B. for C. of D. with

59. John became a football coach in the Sealion Middle School ____ the beginning of

March.

A. on B. for C. with D. at

60. You can’t wear a blue jacket _____ that shirt. It will look terrible. A. on B. above C. up D. over

61. It was a pity that the great writer died ____ his work unfinished. A. for B. with C. from D. of

62. My uncle died ____ heart disease last summer. A. of B. from C. out D. away

63. Ryan made _____ his mind to study hard but he didn’t. A. in B/ C. on D. up

64. What _____ are you guys doing? I am freaking out(我很不安). A. in earth B in the earth C. on the earth D. on earth 65. We hadn’t plan to meet. We met ____ chance. A. of B. in C. for D. by

66. I was just talking to Margaret when Jackson ___. A. cut in B. cut down C. cut out D. cut up

67. Could you please translate this material _____ Spanish？ A. in B. with C. into C. on 68. I couldn’t ____. The line was busy.

A. go by B. go ground C. get in D. get through

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69. The conference has been held to discuss the effect of tourism(旅游业) ___ the

wildlife in the area.

A. in B. on C. at D. with

70. Sandra was a student ____ the age of 21. A. at B. in C. on D. for

71. Scientists say they are beginning to _____ in the fight against cancer. A. break in B. break out C. break down D. break through 72. . As the spring comes, the flowers began to _____. A. come out B. come in C. come on D. come down 73. As we all know(众所周知), the dinosaur has _____. A. died B. died out C. died from D. died of 74. The kids are looking forward to ______ Spring Festival.

A. celebrate B. to celebrate C. celebrating D. being celebrated 75. Everyone in the class studied very hard since no one wanted to _____. A. fall down B fall off C. fall behind D. fall out 76. No matter how hard it is, just go on and never ____. A. give up B. give away C. give in D. give off

77. While you are doing math exercise, put a calculator(计算器) ____ to help you. A. in hand B. at hand C. by hand D. on the hand 78. . Here you are! This is one of the keys ____ the lock. A. of B. for C. to D. in

79. I can’t ______ Tom. He is a real idiot(白痴). A. put up with B. put away C. put on D. put up 80. . After three weeks she had got used _____ alone. A. to be B. be C. to being D. being

81. . Wangmeng won 4 gold medals for China in the winter Olympic Games so we’re

proud _____ her.

A. in B. with C. on D. of

82. Chairman Mao, our forever hero, was born _____ December, 1893. A. at B. on C. in D. to

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83. —What’s happening there?

—Oh. Let me see. There is a panda ______ which causes the traffic jam(交通堵塞). A. by the way B. out of the way C. in the way D. on the way 84. . They witnessed(目睹) a quarrel _____ their way home. A. in B. on C. at D. by

85. Last year, I spent too much time ______ video game and I decided to quit it.

A. in B. on C. with D. from

86. Mary was so surprised _____ what Tom had do to him. A. at B. in C. on D. with

87. —Excuse me? Could you please me tell me where is the nearest inn(客栈) here? —Go ____ the forest and _____ the foot of mountain you will find it. A. across;on B. through;on C. through;at D. across;at 88. Children are feeding the lion _____ meat. A. in B. on C. with D. by

89. When the teacher said there is going to be a long holiday the whole class is ____

great excitement.

A. in B. with C. for D.on

90. Eating less meat is good _____ your high blood pressure(高血压). A. for B. at C. on D. to

91. Jay Chou is famous _____ his R&B songs. A. for B. as C. in D.with

92. The funny cartoon ―Xiyangyang and Huitanglang‖ is popular _____ kids. A. in B. with C. among D. with

93. Could you please send _____ a doctor? My mom is ill. A. for B. in C. to D. out

94. . It is not easy to tell the True _____ the False in the English reading. A. out B. from C. off D. with 95. I have tried so hard but _____ I get nothing.

A. in the end B. at the end of C. at the end D. in the end of 96. This famous drawing is sold ____ 10,000,000 dollars.

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A. in B. by C. with D. at

97. I can hardly work out the answer _____ this difficult question. A. of B. to C. in D.for

98. I got a letter this afternoon. It was ____ my foreign friend. A. from B. in C. in D.at

99. I’m all ____ sea and I’ve no idea how to fix my pencilbox. A. in B. on C. at D. off 100.

. We built this factory ______ top speed and minimum(最少的) cost.

A. in B. at C. with D. on 101.

There is a big and beautiful lake ______ the foot of the hill.

A. at B. in C. with D. on 102.

. We go _____ duty at 8 a.m.

A. on B. in C. at D. for 103.

Li and I arrived ______ Heishan country safe and sound, all is well. Don’t be

worry.

A. in B. on C. / D. at 104.

The kids are doing some experiment ______ the farm in the country.

A. in B. at C. on D. for 105.

We are listening the weather report _____ the radio.

A. over B. in C. with D. from 106.

Sandra said she would be back _____ this morning.

A. in B. on C. at D. / 107.

. Do they work _____ the day time or _____ night?

A. at;in B. in;at C. on;at D. at;on 108.

Lily had left ______ the time we arrived.

A. at B. on C. by D. in 109.

. He arrived _______ Shanghai _______ the morning of January 5.

A. at; in B. in at C. for; on D. in; on 110.

key.

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. Jack was about to lock the door when he just _____ time he remember his

A. on B. in C. at D.by 111.

. Don’t write the letters ______ pencil but ______ ink.

A. with;with B. in;in C. in;with D.with;in

112. 113. 114. 115. 116. 117.

Children wake up very early ____ the morning of Christmas Day. A. in B. on C. for D. at

____ a cold winter morning, I met her in the street. A. In B. On C. At D. For

Why did you get up so early ___ this morning. A. on B. / C. at D. in

提高题

1. people feel very stressed out.

A. on B. with C. at D. in

2. For miles around me there was nothing but a desert, without a single plant or tree _______.

A. in sight B. on earth C. at a distance D. in place

3. I wanted two seats _______ Madame Curie for Friday nigh, so I rang the cinema to see if I could book two tickets. A. of B. about C. to D. for

4. The number of the employees has grown from 1,000 to 1,200, this means it has risen ________ 20 percent.

A. by B. at C. to D. with

5. The sunlight came in _____ the windows in the roof an lit up the whole room.

A. across B. through C. over D. with 6. Tom really hates drinking coffee with milk and sugar _______. A. into B. in C. at D. out

7. They are always _______ a hurry, yet they spend more time relaxing. They are _______ the same time sensitive to the rights of individuals. A. at;in B. in;at C. with;at D. in;at

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8. _____ recent years they have learned how to play, but they make work of that too.

A. In B. With C. From D. At

9. No learner has ever run short _____ subjects to explore. The pleasures of learning are indeed pleasures.

A. in B. / C. of D. with

10. This is a short poem written _____ a light, easy style, but it does make one

wonder and pause to think.

A. at B. in C. on D. with

11. She saw little group on the grass, their faces and hands are white ______ the moonlight.

A. under B. with C. in D. at

12. The engine of the ship was out of order and the bad weather _______ the

helplessness of the crew at sea.

A. added to B. resulted from C. turned out D. made up 13. The accident is reported to have occurred _______ the first Sunday in

February.

A. at B. on C. in D. to

14. Now that he knew his father loved him, there would be no more wandering

_____ the mornings and having to be called again. A. on B. at C. in D. with

15. ______ a quarter to three he got up and crept downstairs, careful of the

creaky boards, and let himself out. A. At B. On C. For D. In

16. The best Christmas gift I ever had, and I will remember it, son, every year

_______ Christmas morning, as long as I live. A. in B. on C. at D. for

17. ―No red rose in all my garden!‖ he cried, and his beautiful eyes filled _____

tears.

A. in B. with C. at D. for

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18. He did not care if it was 100°F in the shade or 20°F ______ zero. A. in B. below C. under D. beneath

19. The other day I encountered the man who fired me. He is a bright man, and

_____ the eve of retirement.

A. in B. at C. for D. on

20. I went to Washington for an interview in early April. It lasted only ______ 15

minutes because the salary was ﹩10.000 less than what I had been making.

A. for B. / C. on D. with

21. She really should sew it, but the sight of the black dress waiting to be made

_______ made her dislike the thought of sewing. A. over B. out C. up D. of

22. Her mother sat ______ the armchair, ripping out the sides of the black

dress.

A. on B. down C. in D. up

23. I came to my friends’ home and they made _____ a bed for me on the sofa. A. for B. out C. / D. of

24. They are the parents of two young children, they had been married nine

years, they lived _______ the _______ floor of an apartment. A. in;twelve B. on;twelfth C. in;twefve D. on;twelfth 25. The Westcotts differed ______ their friends, their classmates and their

neighbors only in an interest they shared in serious music. A. in B. with C. from D. to

26. They went to a great concert and they spent a good deal of time listening to

the music _______ the radio.

A. in B. with C. from D. on

27. If you don’t want to go _______ your own, why not take someone _____

you.

A. on;by B. on;with C. by;with D. with;with

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28. They would throw sharp questions ______ their students and got sharp

answers.

A. to B. at C. in D. for

29. The teacher is writing ____ a piece of chalk on the blackboard while the

students are writing ____ink in exercise books. A. with;in B. in;with C. in, in D. with, with

30. The worker can make chairs ____ wood, and also can make paper ____

wood.

A. from;of B. of;from C. of;of D. from;from

31. The boy is waiting ____ his sister and they will go to the hospital to wait

____ their sick mother.

A.for;on B.on;for C.for;for D.on;on

32. The group is made up ____ five students. And they are studying hard to

make up____ the lost time.

A.of;of B.for;for C.of;for D.for;of

33. She felt disappointed when she found out they had gone swimming____

her.

A. but B. except C. except for D. without

34. He is running ____ the wind towards the east of the station ____ Tom is

running ____ the right.

A. down;and;on B. against;while;on C.for;with;in D. with;while;to 35. I made the coat ____ my own hands. It was made ____ hand, not with a

machine.

A. in;in B.in;with C. with;by D. with;with

36. He looked quite healthy ____ he was ____ the age of seventy. A. when;at B. because;in C. if;for D. though;at

37. Something must be done to prevent our city ____ by thick smoke.

A. to be polluted B. from polluting C. from being polluted D. polluting

38. We offered him our congratulations ____ his passing the college entrance

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exams.

A. at B. on C. for D. of

39. I saw Jack yesterday. He told me that he would stay here _____ the end of this year.

A. at B. by C. for D. till

40. ____ the students likes the paintings. Which is wrong?

A. The teacher as well as B. Nobody but C. The teacher besides D. All except

41. The train leaves ____ 6: 00 p. m. So I have to be at the station ____ 5:40 p. m. at the latest.

A. at;until B. for;after C. at;by D. before;around

42. The word \A. of B. as C. to D. from

43. Go ____ the gate and you' 11 find the entrance ____ the park ____ the other side.

A. through;to;on B. along;of;on C. down;to;at D. up;of;by

44. The Temple of Heaven, the largest group of temple buildings in China, was built ______ southeast Beijing in 1420. A. at B. in C. on D. /

45. Beijing is the center _______ China’s political, cultural, and international activities.

A. in B. of C. for D. on

46. The thief ran away as fast as he could ______ the policeman. A. in sight B. within the sight of C. within sight D. at the sight of 47. I don’t ______ the expense; I want the party to be a real success. A. care for B. care about C. be in care of D. take care of

48. I’ll pick you ______ at your college gate and take you straight to the station. A. on B. off C. out D. up

49. Will you please see ______ our luggage when I am away? A. to B. in C. with D. for

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50. Though we have no interests ______ common, we are good friends. A. on B. in C. for D. at

51. The machines cut big pieces of metal ____small pieces. A. in B. by C. to D. into 52. English is widely used for business____ different countries. A. between B. to C. for D. among 53. The doctor worked___ five hours___ a rest.

A. for;with B. on;without C. about;having D. for;without 54. The workers had been____ strike ____ almost a month. A. on;in B. at;in C. on;for D. on;during

55. Children get gifts ____ Christmas and ____ their birthdays. A. on;on B. at;on C. in;in D. in;on

56. There is a brook____ red flowers and green grass___ both sides.

A. of;with B. with;on C. of;at D. with;in

57. There are many trees ___ of the road! And ____ of the trees is growing

larger and larger.

A. on both side; a number B. on each sides; a number C. on both sides; the number D. on every side; the number 58. Jiangsu is___ the east of China, but Japan is ___ the east of China.

A. to;in B. in;to . C. on;to D. to;on

59. He put up a map ___ the back wall because there was a hole ___ it. A. on;on B. at;in C. on;in D. on;at

60. The United States is ____ the south of Canada and ___ the east of Japan. A. to;in B. on;to C. in;beside D. at;on

61. The man stood ____ the window, watching the boys playing outside.

A. in B. by C. with D. to

62. ___ research ___ the universe scientists have put a lot of information ___ computers.

A. With;over;at B. On;at;to C. In;about;into D. For;with;through 63. When a piece of ice is taken ____ a warm room, it gets smaller and smaller

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until ___ the end it disappears completely. A. in;in B. out of;at C. into;in D. to;by

64. The tables in the restaurant are so close together that there's hardly any room to move ___ them.

A. among B. between C. in the middle of D. at the centre of 65. We visited him at his workplace ___ the young trees and ask him about his work.

A. in B. among C. between D. at

66. We need fifteen more people ____ the twenty of us to do the job. A. besides B. and C. except D. without

67. When they had finished playing, the children were made to ______ all the toys they had taken out.

A. put off B. put away C. put up D. put out 68. Mary is _______ her face ready for the party.

A. clearing up B. holding up C. keeping up D. making up 69. One day people will be able to go to the moon _____ holiday. A. on B. during C. for D. in

70. How did it come _____ that you made a lot of mistakes in your homework? A. about B. after C. with D. to

71. The mass of an object is multiplied by the speed of light squared, _____ other words , the speed of light is multiplied by itself. A. by B. for C. in D. with

72. Tom has been sad recently, for his plan to go to college _____ at the last moment.

A. fell out B. fell behind C. fell in D. fell through

73. The teacher expects us to do all the exercises, to study the spelling list and to get our paper ______ time.

A. in B. on C. at D. by

74. Science was ______ regarded as a part of philosophy. A. at times B. at all time C. at a time D. at one time

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91. 解析：选A。it is not long before固定搭配 没过多久就… 92. 解析：选C。with a smile 固定搭配 面带微笑。

93. 解析：选C。通过收音机on radio 在某个频道用介词at。 94. 解析：选A。with表示伴随。 95. 解析：选B。on+V-ing 表示一…..。 96. 解析：选D。worry about 担心…。

97. 解析：选C。shout at有感情色彩 shout to没有感情色彩。 98. 解析：选D。

99. 解析：选A。the day after tomorrow后天 前面不加介词。 100. 真题

1. -解析：选A。在年份的前面用介词in。 2.解析：选B。by表示方式。

3.解析：选C。在月份的前面用介词in。

4.解析：选B。be worried about 固定搭配 担心… 5.解析：选B。on time按时

6.解析：选B。根据句意 without没有

7.解析：选C。在具体的某一天的晚上用介词on。

8.解析：选C。look for固定搭配 寻找 look like看起来像 look at看 look after照看。

9.解析：选A。look up查字典

10.解析：选D。be famous for固定搭配 因…而著名。 11. 解析：选B。between … and在两者之间。

12.解析：选D。arrive in大地点 arrive at小地点 在具体的某一天的早上用介词on。

13.解析：选D。在事物的内部用介词in；be different from…和…不同。 14解析：选C。arrive in大点的 arrive at小地点。 15.解析：选A。在具体的某一天的早上用介词on。

16. 解析：选B。because of由于 thanks to多亏 instead of代替 as for至于

解析：选D。praise sb for sth

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17. -解析：选C。根据句子里的in front of可以判断在图书馆外。 18解析：选C。在年份的前面用介词in。 19. 解析：选B。在时间点前面用介词at。 20. 解析：选C。against表示反对。

21.解析：选B。固定搭配 it is adj for sb to do sth 对于某人来说做某事是怎么样的。

22. 解析：选B。在某个地方等 wait at。

23. 解析：选B。in public大庭广众下 at least至少 on time按时。 24.解析：选A。except除了。

25. 解析：选C。在月份前面用介词in。 26. 解析：选B。根据句意 in front of在…前面。

27. 解析：选C。through表示从事物内部通过 across表示从事物表面通过。 28. 解析：选C。be proud of固定搭配 对…感到骄傲。 29. 解析：选B。通过某种方式用by。

30.解析：选B。在具体的某一天的晚上用介词on。 31. 解析：选B。在特指的某个早上前用介词on。 32. -解析：选B。在具体的某一天的早上用介词on。 33.解析：选A。do with对待。 34. 选A。在外部用介词to。

35. 解析：选B。根据句意fly into飞进去。 36. 解析：选C。在具体的某一天前用介词on。

37 .解析：选D。from是介词所以要跟名词或动名词做介词的宾语。 38. 解析：选B。on the right side在右边。 39. 解析：选B。在早上 用介词in。

40.解析：选D。remind of 唤起… on farm固定搭配 在农场。

41.解析：选C。at times有时 on time按时 at a time一次 all the times总是。 42. 解析：选B。with表示伴随。

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43. 解析：选A。live in住在… on…floor在…层。 44解析：选D。在具体的某一天的下午用介词on。

45.解析：选C。it is adj of sb to do sth 某人做某事是怎么样的 it is后面的形容词为形容人特性的形容词。

46.解析：选A。根据句意over表示结束。 47. 解析：选A。in surprise固定搭配 惊奇地 48. 解析：选D。在物体上面用介词on。 49. –解析：选B。通过某种方式用介词by。 50. 解析：选D。by bus固定搭配 坐公交车。

51解析：选C。for表示一段时间和前面的完成时照应。 52. 解析：选C。在具体的某一天用介词on。 53. 解析：选A。表示目的，用途。

54.解析：选C。stop sb from doing sth 阻止某人做某事。

55. 解析：选C。put off推迟 put on穿上 put up挂起来 put down镇压。 56. 解析：选C。talk with 和某人谈话。 57. 解析：选B。be worried about… 担心… 58.解析：选B。except表示除…之外。 59. 解析：选B。for表示给 with表示伴随。 60. 解析：选B。for表示给 在节日前面用介词on。 61解析：选B。be famous for因…而著名。

62. I解析：选B。be late for school 固定搭配 上学迟到。 63. 解析：选B。for表示为了。 64. 解析：选C。be jammed with挤满了

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65. 解析：选D。be different in在某方面不同。 66.解析：选B。with表示通过某种方式。 67. 解析：选D。by bike固定搭配 骑自行车。 68. 解析：选C。in加一段时间 表示这段时间之后。

69. 解析：选D。in加一段时间表示这段时间之后 而before只能跟时间点连用。 70. 解析：选B。be proud of固定搭配 对…感到骄傲。 71. 解析：选B。be good at固定搭配 擅长于。 72. 解析：选B。by bus固定搭配 坐公交车。 73. 解析：选C。be made from看不出原材料。 74. 解析：选D。among表示两者以上的中间。 75. 解析：选C。for表示对于某人来说。

76. 解析：选C。hand in上交 固定搭配 on time按时。 77.解析：选C。agree with sb同意某人 at once立刻马上。 78. 解析：选B。around表示四处 in the world在时间范围内 79. 解析：选A。with表示伴随 在手中用介词in。 80. 解析：选B。instead of代替。

81.解析：选A。across表示从事物的表面通过。on the other side在另一边 固定搭配。

82.解析：选C。before表示在…之前。

83. 解析：选A。across表示从事物的表面通过。 84.解析：选D。在时间点前面用介词at。

85. 解析：选B。in加一段时间表示这段时间之后。 86. 解析：选A。在具体的某一天前面用介词on。

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87. 解析：选D。not until直到…才

88解析：选B。方位的表达in表示内部 to表示外部。 89. 解析：选C。over表示垂直之上 不接触。 90. 解析：选C。among表示两者以上的中间。

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