单项选择题

Mary's eyes are red. She ______ crying.

A．may
B．is
C．must have been
D．should be
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单项选择题
Several questions on this plan ______ at the meeting.
A．have proposed
B．have been proposed
C．has proposed
D．has been proposed
单项选择题
-- Could you go there on Friday or Sunday-- I'm afraid ______ day is possible.
A．any
B．both
C．either
D．neither
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