单项选择题

It's high time we _________something to stop road accidents.

A．did
B．are doing
C．will do
D．do
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单项选择题
I've never seen the young man _________next to the director.
A．sits
B．sitting
C．sat
D．to sit
单项选择题
Don't_________. I can help you with the typing.
A．matter
B．care
C．worry
D．concern
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