单项选择题

We have been told that under no circumstances ______ the telephone in the office for personal affairs.

A．may we use
B．we may use
C．we could use
D．did we use
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单项选择题
He ______unwisely, but he was at least trying to do something helpful.
A．may have acted
B．must have acted
C．should act
D．would act
单项选择题
Then it was Jerry’’s duty to cautiously ______ the arrow had it missed the mark.
A．recover
B．regain
C．refund
D．retrieve
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