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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单项选择题
Mr. Jones, ______ you tell me what has happened
A. may
B. must
C. might
D. could
单项选择题
You ______ her in her office, because she’s been on business just for a week.
A. needn’t have seen
B. might have seen
C. must have seen
D. can’t have seen
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