情態(tài)動詞專練及解析
    1. We hope that as many people as possible _____join us for the picnic tomorrow.
    A. need B. must C. should D. can
    2. Some aspects of a pilot’s job _____ be boring, and pilots often _____ work at inconvenient hours.
    A. can; have to B. may; can
    C. have to; may D. ought to; must
    3. A left luggage office is a place where bags _____ be left for a short time, especially at a railway station.
    A. should B. can C. must D. will
    4. The fire spread through the hotel very quickly but
    everyone _____ get out.
    A. had to B. would
    C. could D. was able to
    5. He paid for a seat, when he _____ have entered free.
    A. could B. would C. must D. need
    6. We _____ have proved great adventures, but we have done the greatest march ever made in the past ten years.
    A. needn’t B. may not
    C. shouldn’t D. mustn’t
    7. Johnny, you _____ play with the knife, you _____ hurt yourself.
    A. won’t; can’t B. mustn’t; may
    C. shouldn’t; must D. can’t; shouldn’t
    8.— May I smoke here?
    — If you _____, choose a seat in the smoking section.
    A. should B. could C. may D. must
    9. This cake is very sweet. You _____ a lot of sugar in
    it.
    A. should put B. could have put
    C. might put D. must have put
    10. My sister met him at the Grand Theatre yesterday afternoon, so he _____ your lecture.
    A. couldn’t have attended
    B. needn’t have attended
    C. mustn’t have attended
    D. shouldn’t have attended
    11. I was on the highway when this car went past followed by a police car. They _____ at least 150 km an hour.
    A. should have been doing
    B. must have been doing
    C. could have done D. would have done
    12.— Shall I tell John about it?
    — No, you _____ . I’ve told him already.
    A. needn’t B. wouldn’t
    C. mustn’t D. shouldn’t
    13. It has been announced that candidates _____ in their seats until all the papers have been collected.
    A. can B. will C. may D. shall
    14. — I think I’ll give Bob a ring.
    — You _____ . You haven’t been in touch with him for ages.
    A. will B. may C. have to D. should
    15. You can’t imagine that a well-behaved gentleman _____ be so rude to a lady.
    A. might B. need C. should D. would
    16. I told Sally how to get here, but perhaps I _____ for her.
    A. had to write it out
    B. must have written it out
    C. should have written it out
    D. ought to write out
    17. I was really anxious about you. You _____ home
    without a word.
    A. mustn’t leave B. shouldn’t have left
    C. couldn’t have left D. needn’t leave
    18.— Write to me when you get home.
    — _____ .
    A. I must B. I should
    C. I will D. I can
    19. When he was there, he _____ go to that coffee shop at the corner after work every day.
    A. would B. should C. had better D. might
    20. Mother _____ us stories when we were young.
    A. was used to tell B. is used to telling
    C. used to tell D. used to telling
    21.—Lucy doesn’t mind lending you her dictionary.
    — She _____ . I’ve already borrowed one.
    A. can’t B. mustn’t
    C. needn’t D. shouldn’t
    22. The weather turned out to be fine yesterday. I _____ the trouble to carry my umbrella with me.
    A. should have taken B. could have taken
    C. needn’t have taken D. mustn’t have taken
    23. I wonder how he _____ that to the teacher.
    A. dare to say B. dare say
    C. not dare say D. dared say
    24. It’s freezing outside. You _____ put on your overcoat.
    A. had better to B. had better
    C. would rather D. would better to
    25.— Shall we go skating or stay at home?
    — Which _____ do yourself?
    A. do you rather B. would you rather
    C. will you rather D. should you rather
    答案與解析：
    1. D. 此處can表示 “能力”。
    2. A. 此處can表示推測“可能”的意思；have to表示“不得不”，強調客觀情況。
    3. B.此處can表示允許，許可。
    4. D. 在表示能力時，can(could)和be able to在很多情況下能夠互換，但在下列情況下只能用be able to: ①位于助動詞后；②位于情態(tài)動詞后；③表示成功地做了某事。本題即屬于第三種情況。
    5. A. could have done用于肯定句中表示本來能夠做成某事但結果沒能做成，含有遺憾的意味，側重有能力而沒有能做成。
    6. B. may not表示“可能不”，表示不太確定的推測。
    7. B. mustn’t表示“禁止”，may表示不太確定的推測。
    8. D. 這里must表示必要性，意為“必須，一定要”。
    9. D. must have done表示對過去發(fā)生的事情的肯定推測，意為“想必，準是，一定是”
    10. A. can/could not have done表示對過去的否定推測“不可能做過……”。
    11. B. must have been doing表示對過去進行時態(tài)或者過去完成進行時態(tài)的肯定推測。
    12. A. shall用于主語為第一、三人稱的疑問句中表示建議、征求對方意見時，其回答一般用“Yes, you must.”或“ No, you needn’t.”。
    13. D.在主語為第二、三人稱的肯定句中，shall表示決心、許諾、命令等。
    14. D. should指“應該”，表示命令、勸告或建議等。
    15. C. 在某些名詞性從句中，should可以表示驚異、意外等情況，意思是“竟然”。
    16. C. should /ought to have done“表示本該做某事卻未做”，其否定形式shouldn’t /ought not to have done則表示“本不該做某事卻做了”。
    17. B. 本句表示本不該做某事卻做了。
    18. C. will與第一人稱連用表示意愿、意志。其它選項則不能表示意愿。
    19. A. would表示過去習慣性的動作。
    20. C. used to表示“過去的習慣動作或狀態(tài)（現(xiàn)在 已不這樣）”，其后接動詞原形。
    21. C. 選項A表示“不能、不許”；B表示“不行、禁止”；C表示“不必、不需要”；D為“不應該”。
    22. C. needn’t have done表示過去本不必做某事而實際已做了某事，強調“不必要”，其肯定式need have done則表示過去本需要做某事而實際上未做。
    23. D. dare作實義動詞時其后的不定式可帶to，也可以不帶to，此句中的實義動詞dare的時態(tài)應為一般過去時態(tài)。
    24. B. had better表示“……”，后接動詞原形，其否定式為“had better not”.
    25. B. 能夠表示“寧愿、寧可”意思的就只有B。