单项选择题

He couldn't use his own car because it ______ then.

A．was being repaired
B．was repairing
C．is repairing
D．has been repaired
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单项选择题
It took them more than ten years to ______ the defensive works.
A．build
B．build into
C．build on
D．build up
单项选择题
His hard work ______ when he won the prize.
A．paid off
B．showed of
C．rang off
D．kept off
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