单项选择题

I think it's high time we ______ measures to protect the environment.

A．took
B．will take
C．take
D．have taken
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单项选择题
______ the sports meeting will. be held is not known yet.
A．If
B．Whether
C．Weather
D．Both A and B
单项选择题
The student is different ______ all the students I have seen,
A．on
B．among
C．with
D．from
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