单项选择题

The stockings are so ______ that they can’t be mended any more.

A．taken off
B．pulled on
C．worn out
D．thrown away
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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
单项选择题
Use the following words in sentences, to ______ their meanings.
A．bring to
B．bring about
C．bring out
D．bring up
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