单项选择题

He left, ______ by anyone.

A．not notice
B．not being noticed
C．being not noticed
D．not noticing
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单项选择题
______ only the 4 members of the committee who attended the meeting last night.
A．That is
B．There were
C．It was
D．There is
单项选择题
If I ______ harder for the final exam, I should have passed it.
A．study
B．had studied
C．studied
D．was studying
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