单项选择题

It's high time we ______ something to stop traffic accidents.

A．do
B．will do
C．did
D．must do
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The students are busy ______ the examination.
A．preparing for
B．preparing
C．to prepare
D．to prepare for
单项选择题
A lot of people have tried, but ______ have succeeded.
A．the few
B．a few
C．some
D．few
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