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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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
单项选择题
Did you go to Belgium last year when you were on a business trip to Europe No, ______ there
A．I have never gone
B．I never did
C．I've never been
D．I never was
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