单项选择题

Great efforts must be made if the war ______ avoided.

A．will be
B．can be
C．has been
D．is to be
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单项选择题
The car ______ speed as it went down the hill.
A．increased
B．won
C．obtained
D．gained
单项选择题
This box is ______ that one.
A．twice as heavy as
B．as twice heavy as
C．twice heavy than
D．as heavy as twice
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