单项选择题

There are some more topics to discuss, _________the problem of pollution.

A．generally
B．especially
C．exactly
D．probably
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It's high time we _________something to stop road accidents.
A．did
B．are doing
C．will do
D．do
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
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