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
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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单项选择题
Cats sleep ______ day and hunt ______ night.
A.in, in
B.at, at
C.during, during
D.by, by
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