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
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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
单项选择题
Gettysburg was the ______ of the most important battle in American Civil War.
A．scene
B．view
C．sight
D．landscape
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