单项选择题

What may happen to you, if you ______in your school work

A．fall down
B．fall apart
C．fall off
D．fall behind
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单项选择题
______I admit that there are problems, I don't agree that they cannot be solved.
A．When
B．As
C．While
D．Since
单项选择题
But for the rain, we______ a nice holiday.
A．should have
B．would have had
C．would have
D．well enough
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