单项选择题

Some hard plastics can______metals in manufacturing machine parts.

A．take place at
B．take the place for
C．take place of
D．take the place of
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单项选择题
There’ s no need to be frightened of the dog, and he’ s quite______.
A．eager
B．harmless
C．cheerful
D．weak
单项选择题
Have dinner with us,______
A．will you
B．are you
C．would you
D．aren’t you
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