A. mustn't attend
B. can't have attended
C. would have not attended
D. needed have attended
8. They _________ the plane, or perhaps they have been prevented from coming for some reason.
A. can have missed
B. may have missed
C. can have lost
D. may have lost
9. Since the ground is white, it _________ last night.
A. had snowed
B. must have snowed C. must be snowing
D. must have been snowing
10. You must be fifty, ________?
A. mustn't you
B. needn't you
C. aren't you
D. mnyn't you
11. You must have seen him off yesterday, _________?
A. haven't you
B. didn't you
C. mustn't you
D. needn't you
12. ---- That must be a mistake.
---- No .it _________ be.
A. can't
B. isn't 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. mustn't
B. can't
C. needn't
D. shouldn't
14. How ________ so?
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