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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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
单项选择题
The swimmer was very tired but he ______ reach the shore before he collapsed.
A. could
B. was able to
C. might
D. may
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