单项选择题

Since the introduction of the new technique, the production cost（）greatly.

A．reduces
B．has been reduced
C．is reducing
D．is reduced

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单项选择题
We got down to business as soon as we（）each other.

A．had introduced to
B．had been introduced to
C．had introduced by
D．had been introduced by
单项选择题
Eighty-two people were reported（）in the plane crash.

A．to have injured
B．to have been injured
C．injured
D．injuring
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