单项选择题

More than one official（）involved in the case.

A．were
B．was
C．being
D．be

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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
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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