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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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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