单项选择题

Hangzhou, （）we spent last spring, is one of the most beautiful cities in China.

A. where
B. which
C. that
D. when

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All life on the earth（）on the sun.

A. depends
B. carries
C. keeps
D. goes
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The book （） interesting, but it's very instructive.

A. can't be
B. may not be
C. should not be
D. might be
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