单项选择题

Since the ground is wet, it（）last night.

A．must rain
B．must have rained
C．had rained
D．rained

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单项选择题
（）is expected, all the students in his class passed the final examination.

A．As
B．Which
C．That
D．What
单项选择题
（）the result, I would not have asked you to tell me.

A．If I know
B．Had I known
C．I had known
D．If I knew
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