单项选择题

You can come and see me()you run into difficulty.

A．some time
B．in time
C．whether
D．whenever

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单项选择题
The thought never crossed the villagers' mind () they should move to another place so that a power station could be built.

A．which
B．that
C．when
D．where
单项选择题
Recent study shows that regular review leads to () performance on tests.

A．improve
B．improves
C．improved
D．improvement
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