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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I think it's high time we（）measures to protect the environment

A．took
B．will take
C．take
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Mary has got a full mark in the test. She（）very hard all the time.

A．will work
B．must have worked
C．may work
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