单项选择题

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

A．invented
B．discovered
C．found
D．developed
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______ leaves the. classroom should tell me.
A．Anyone
B．None
C．Whoever
D．Everyone
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I don't think Jim saw me. He ______ into space.
A．just stared
B．has just stared
C．had just stared
D．was just staring
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