单项选择题

We can hardly avoid making any mistakes in our work ______ hard we try.

A．whatever
B．how
C．no matter
D．however
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单项选择题
A lot of people have tried, but ______ have succeeded.
A．the few
B．a few
C．some
D．few
单项选择题
It's high time we ______ something to stop traffic accident.
A．do
B．will do
C．did
D．must do
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