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

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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
单项选择题
（）what to do, he went to the manager for help.

A、 Not to know
B、 Not knowing
C、 Not having known
D、 Having not known
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