单项选择题

I suppose that they do not have a clear idea who________the story.

A．originated
B．generated
C．manufactured
D．estimated
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单项选择题
He took________smoking and drinking when he was very young.
A．in
B．on
C．off
D．to
单项选择题
China is one of the few countries in the world that have devoted great efforts to________ world peace.
A．preserving
B．conserving
C．possessing
D．reserving
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