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
______ , he would feel exhausted after a whole day's work.
A．Strong as is he
B．Strong as he is
C．As he is strong
D．As strong is he
单项选择题
You'd better ______ the water until it has been boiled.
A．not to drink
B．not drink
C．not drunk
D．not drinking
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