A. had snowed B. must have snowed C. must be snowing D. must have been snowing
10. You must be fifty, ________?
A. mustnt you B. neednt you C. arent you D. mnynt you
11. You must have seen him off yesterday, _________?
A. havent you B. didnt you C. mustnt you D. neednt you
12. ---- That must be a mistake. ---- No .it _________ be.
A. cant B. isnt able to C. can D. was able to
13. He had known the matter before you told him, so you _________ have told it to him.
A. mustnt B. cant C. neednt D. shouldnt
14. How ________ so?
A. dare you to say B. dare you say C. do you dare say D. dare to say
15. You are their teacher. You _________ care of them.
A. should to take B. might to take C. ought to take D. need to take
16. She is studying medical science now but she _________ a lawyer.
A. used to be B. would be C. were D. had been
17. If you were in an English-speaking country, you, too, _________ English every day.
A. will be used to speak B. will be used to speaking
C. must be used to speak D. would be used to speaking
18. I did not call to make my airline reservation (预订) but I _________.
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