单项选择题

Some hard plastics can ______ metals in manufacturing machine parts.

A．take place for
B．take the place for
C．take place of
D．take the place of
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There s no need to be frightened of the dog, and he s quite ______.
A．eager
B．harmless
C．cheerful
D．weak
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Have dinner with us, ______
A．will you
B．are you
C．would you
D．aren"t you
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