单项选择题

The staff, having finished work for the day, ______ going home now.

A．is
B．are
C．was
D．were
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单项选择题
It is human nature to think back to Golden Age ______ one's country was strong and respected.
A．when
B．provided
C．as
D．unless
单项选择题
A body, ______ it is in motion, would never stop itself if there were no friction.
A．where
B．by time
C．once
D．at the moment
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