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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单项选择题
This year they have produced ______ grain ______ they did last year.
A．as less... as
B．as few... as
C．less... than
D．fewer... than
单项选择题
Do you know the boy ______ under the big tree7
A．lay
B．lain
C．laying
D．lying
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