单项选择题

Several questions on this plan （） at the meeting.

A.have proposed
B.has proposed
C.have been proposed
D.has been proposed

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单项选择题

Mary's eyes are red. She （） crying.

A.may
B.must have been
C.is
D.should be

单项选择题

（） it doesn't rain, we can camp in the woods.

A.As long as
B.As well
C.As if
D.As for

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