单项选择题

Theory is based on practice, ______ in turn serves practice.

A. that
B. what
C. who
D. which
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单项选择题
Everyone believes that the day will come ______ people all over the world live a rich and happy life.
A. when
B. where
C. which
D. why
单项选择题
I have never seen a TV program ______ the man cannot find a parking space at the very first try.
A. where
B. which
C. when
D. there
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