单项选择题

He won the scholarship. He () hard these terms.

A. should have worked
B. must have worked
C. must have been working
D. could have worked

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We have not decided which hotel().

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B. to stay
C. staying at
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单项选择题
()we can get rid of poUution is still a big problem.

A. Whether
B. If
C. that
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