单项选择题

I don’t believe him, he ______ be serious.

A. needn’t
B. can’t
C. shouldn’t
D. mustn’t
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单项选择题
The onset of spring in Britain ______ come quietly this year due to dwindling numbers of cuckoo.
A. might
B. would
C. may
D. can
单项选择题
She was absent from class for a week. She ______ sick.
A. may be
B. could be
C. might be
D. must have been
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