单项选择题

It is well known that Tomas Edison ______ the electric lamp.

A．discovered
B．found
C．developed
D．invented
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单项选择题
He was in hospital for six months. He felt as if he was ______ from the outside world.
A．cut out
B．cut off
C．cut up
D．cut through
单项选择题
The chairman suggested that she ______ a few minutes before the meeting began.
A．will arrive
B．would arrive
C．arrive
D．may arrive
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