单项选择题

They ______ in spite of the extremely difficult conditions.

A．carried out
B．carried off
C．carried on
D．carried forward
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单项选择题
This room is ______ that one.
A．three times large than
B．three times large as
C．as large three times as
D．three times as large as
单项选择题
Don't ______ this news to the public until we give you the go-ahead.
A．release
B．relieve
C．relate
D．retain
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