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
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
单项选择题
He demanded that we explain what was happening,
A．hadn't we
B．didn't we
C．hadn't he
D．didn't he
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