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
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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
单项选择题
Mr. Jones, ______ you tell me what has happened
A. may
B. must
C. might
D. could
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