单项选择题

The business of doctors is to prevent and ______. disease.

A．kill
B．cure
C．wound
D．injure
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单项选择题
He failed his exam, ______ proved that he wasn't working hard enough.
A．what
B．of which
C．which
D．that
单项选择题
As fuel prices rose, bus companies raised their fares and ______.
A．so did the airlines
B．nor did the airlines
C．so the airlines did
D．nor the airlines did
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