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
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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
单项选择题
The lift was out of ______, so we had to walk all the way up to the top floor.
A．function
B．work
C．order
D．running
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