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
It isn't ______John says that annoys me but the way he says it.
A．how
B．that
C．why
D．what
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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