单项选择题

He took ______ smoking and drinking when he was very young.

A．in
B．on
C．off
D．to
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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
单项选择题
At the inauguration ceremony, the newly elected president ______ his speech with a few words of thanks to his supporters.
A．preceded
B．proceeded
C．precluded
D．advanced
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