单项选择题

The students ought to study harder, ______

A. oughtn’t they
B. ought they
C. don’t they
D. do they
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I think it is high time we ______ a solution to the pollution.
A. found
B. will find
C. find
D. have find
单项选择题
The supermarket ______ we usually buy food and drinks is not far away from here.
A. that
B. which
C. what
D. where
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