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
______ John could not pass the final exam was once believed by all his roommates.
A．For
B．It was
C．That
D．While
单项选择题
Only when one loses freedom ______ one know its value.
A．should
B．does
C．did
D．might
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