单项选择题

He has solved the problem（）the tractor was out of order.

A．why
B．for which
C．which
D．that

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单项选择题
-- Let's go dancing,（）.-- Yes.

A．shall we
B．will we
C．don't we
D．do we
单项选择题
But for your help, I（）it.

A．should have done
B．shouldn't have done
C．couldn't have done
D．could have done
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