单项选择题

Mary has got a furl mark in the test. She ______ very hard all the time.

A．will work
B．must have worked
C．may work
D．could have worked
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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
______ 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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