单项选择题

Jack is very exhausted, he should stop ______ and go out for a rest.

A．to study
B．studying
C．of studying
D．to have studied
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单项选择题
She would have been more agreeable if she had changed a little bit, ______
A．hadn't she
B．hasn't she
C．wouldn't she
D．didn't she
单项选择题
According to the weather forecast, which is usually ______, it will snow this afternoon.
A．accurate
B．precise
C．exact
D．perfect
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