单项选择题

______ we can get rid of pollution is still a big problem.

A. Whether
B. If
C. that
D. what
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We have not decided which hotel______.
A. to stay at
B. to stay
C. staying at
D. for staying
单项选择题
No one except Tom and Mary ______ late for the class.
A. are
B. is
C. were
D. was
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