单项选择题

I am sorry I______ your glasses off the desk when I was wiping it.

A．hit
B．knocked
C．struck
D．drew
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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
I know it has gone past but I just can't help______ about it.
A．to think
B．thinking
C．thought
D．to be thought
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