单项选择题

Some hard plastics can be ______ metals in manufacturing machine parts.

A．substituted for
B．taken the place of
C．replaced in
D．given way to
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单项选择题
The child was ______ by a lorry as he ran across the road.
A．turned down
B．hit on
C．kicked off
D．knocked down
单项选择题
As I went on with my story, he ______ with wonderful ! from time to time.
A．broke up
B．broke in
C．broke into
D．broke down
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