1. —That must be a mistake.
　　　 —No, it _____ a mistake.
　　A. must not be 　　B. needn’t be 　　C. cannot be 　　D. would not be

　　2. —_____ I water the trees on Tuesday?
　　　 —No, you needn’t.
　　A. Can 　　B. Must 　　C. May 　　D. Shall

　　3. He _____ not pay unless he is punished to pay.
　　A. shall　　 B. will 　　C. can 　　D. would

　　4. I _____ such a mistake again.
　　A. shall never make 　　B. may never make 　　C. can never do 　　D. need never do

　　5. —_____ I turn on the radio?
　　　 —You’d better not. It is noisy enough in this room.
　　A. Shall 　　B. Must 　　C. Need 　　D. Do

　　6. Let’s go to the library this afternoon, _____?
　　A. shall we　　 B. will we 　　C. can we 　　D. should we

　　7. Where are my keys? I _____ lost them.
　　A. ought to 　　B. should have 　　C. will have 　　D. must have

　　8. Even if he has time, he _____ shopping in town on Sunday.
　　A. won’t go 　　B. will go 　　C. won’t go to 　　D. doesn’t go

　　9. He _____ finished earlier.
　　A. shall have 　　B. ought to 　　C. could have 　　D. must have

　　10. In case I _____, I would try again.
　　A. will fail 　　B. would miss 　　C. should fail 　　D. shall miss

　　11. Since the road is wet this morning, _____ last night.
　　A. it must rain 　　　　　　 B. it must have rained
　　C. it must be rained 　　　　D. it must have been rained

　　12. He asked me if he _____ open the window.
　　A. shall 　　B. would 　　C. will 　　D. should

　　13. Everyone _____ do his best to make the world safe and clean.
　　A. can 　　B. may 　　C. should 　　D. had to

　　14. _____ to have lunch with us today?
　　A. Do you like 　　B. Would you like 　　C. Will you like 　　D. Have you like

　　15. —Will you lend me your book?
　　　　—Yes, I _____.
　　A. will 　　B. need 　　C. can 　　D. must

　　16. If I had time, _____ see that new movie at the Capital Theater.
　　A. I will 　　B. I may 　　C. I shall 　　D. I would

　　17. The English of her composition is too good. She can’t _____ it herself.
　　A. have to write 　　B. have written 　　C. write 　　D. be written

　　18. You _____ the look on his face when he won the lottery.
　　A. would have seen 　　B. can be seeing 　　C. must see 　　D. may see

　　19. The light is out in her room; she _____ to bed.
　　A. must have gone　　 B. had gone 　　C. must be going 　　D. must go

　　20. They _____ that far; but they stopped to have a snack on the way.
　　A. might be gone 　　B. needed go 　　C. could have gone 　　D. ought have gone

　　21. He _____ to the farm yesterday.
　　A. need go 　　B. needed go 　　C. has to go 　　D. had to go

　　22. He is so strong that I _____ fight against him.
　　A. dare not 　　B. did dare not 　　C. didn’t dare to 　　D. dare not to

　　23. I couldn’t _____ cry while I was watching the movie “To live”.
　　A. help to 　　B. help 　　C. help but to 　　D. help but

　　24. They asked Tom to give him a drink, but he _____.
　　A. hadn’t 　　B. wasn’t 　　C. wouldn’t 　　D. could

　　25. As physics is hard enough, I _____ study it.
　　A. am not able 　　B. couldn’t 　　C. am not able to 　　D. cannot

　　26. You _____ to the meeting this morning if you have something important to do.
　　A. needn’t to come 　　B. don’t need come 　　C. don’t need coming 　　D. needn’t come

　　27. _____ you fetch me some hot water?
　　A. Can 　　B. May 　　C. Must 　　D. Might

　　28. You _____ get down the bus until the bus has stopped.
　　A. can’t 　　B. needn’t 　　C. mustn’t 　　D. don’t

　　29. —Would you come and join us?
　　　　—I wish I _____. I am busy at the moment.
　　A. can 　　B. could 　　C. would 　　D. should

　　30. You _____ right, but I don’t think you are.
　　A. may be 　　B. could be 　　C. would be 　　D. should be

　　31. She looks so sad. She _____ ill.
　　A. can be 　　B. should be 　　C. must be 　　D. will be

　　32. He _____ away. We don’t see him anywhere around.
　　A. may go 　　B. must go 　　C. can go 　　D. must have gone

　　33. He is much richer than what he _____.
　　A. would be 　　B. must be 　　C. used to be 　　D. could be

　　34. The little kid _____ not touch the dog.
　　A. need 　　B. dare 　　C. ought 　　D. could

　　35. I want to go to the hospital, but you _____ with me.
　　A. need to not to go 　　B. do not need go 　　C. need not go 　　D. need go not

　　36. When he was old, Mr Smith _____ sit for hours without saying anything.
　　A. would 　　B. should 　　C. must 　　D. will

　　37. Mary _____ be in London because I saw her in town just now.
　　A. mustn’t 　　B. isn’t able to 　　C. may not 　　D. cannot

　　38. The door is still closed. He _____ the key.
　　A. must have lost 　　B. must lose 　　C. need have lost 　　D. can lost

　　39. The bus had left, so we _____ walk home.
　　A. have to 　　B. ought 　　C. had to 　　D. must

　　40. You _____ see her, but I must.
　　A. haven’t　　 B. cannot 　　C. mustn’t 　　D. needn’t

答　案

　　　1—5 CBBAA　　　6—10 ADACC　　 11—15 BDCBA　　 16—20 DBAAC

　　21—25 DADCC　　 26—30 DACBA　　 31—35 CDCBC 　　36—40 ADACD

　　解析：
　　1. cannot表示否定的推测。
　　2. 用must提问通常用needn’t来做否定回答。
　　3. will表示意愿。
　　4. shall用在第一人称构成将来时态。
　　5. shall用在疑问句中表示征求对方的意见。
　　6. Let’s的反意疑问句用shall we构成。
　　7. must have done表示对过去的事情的肯定推测。
　　8. won’t表示意愿。
　　9. could have done表示“本来可以……”。
　　10. in case的意思是“万一……”，后面经常用should的虚拟语气形式。
　　11. must have done表示对过去的事情的肯定推测。
　　12. should是shall的过去式，用在过去时中表示征求对方意见。
　　13. should表示有责任、应该做某事。
　　14. would you like to是用来向对方提出邀请时的表达法。
　　15. will表示意愿。
　　16. would表示与现在事实相反的虚拟语气。
　　17. can’t have done表示对过去情况否定的推测，翻译成“不可能”。
　　18. would have done表示与过去事实相反的虚拟语气。
　　19. must have done表示对过去的事情的肯定推测，翻译成“一定是”。
　　20. could have done表示“本来可以……”。
　　21. had to表示“不得不”；need作情态动词时用在否定及疑问句中。
　　22. dare作情态动词时直接用not进行否定，后面用动词原形。
　　23. can’t help but do表示“忍不住”。
　　24. would用在过去时中表示意愿。
　　25. be able to表示在特定情况下做成一件事。
　　26. need作情态动词时直接用not进行否定，后面用动词原形。
　　27. can用在疑问句中表示向对方提出请求。
　　28. mustn’t表示“禁止、不能”。
　　29. wish后面的宾语从句要用虚拟形式。
　　30. may表示不太肯定的推测。
　　31. must be表示对现在状态的肯定推测。
　　32. must have done表示对过去的事情的肯定推测。
　　33. used to be表示“过去……”。
　　34. dare作情态动词时直接用not进行否定，后面用动词原形。
　　35. need作情态动词时直接用not进行否定，后面用动词原形。
　　36. would表示过去的某种习惯动作。
　　37. can’t be表示对现在状态的否定推测，翻译成“不可能”。
　　38. must have done表示对过去的事情的肯定推测。
　　39. must表示主观需要；have to表示客观要求，翻译成“不得不”。
　　40. needn’t表示“不需要”。