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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单项选择题
I would pay ______ for the book because I love it so much.
A．much twice
B．two times
C．twice as much
D．as much twice
单项选择题
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
D．could have worked
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