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
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
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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