单项选择题

______ percentage of working women in the United States has doubled since 1940 has been the result of both economic and social factors.

A．The
B．That the
C．There is the
D．It is the
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单项选择题
The witness told the court that he ______ the accused before.
A．had ever seen
B．had never seen
C．hadn't ever been seeing
D．didn't have ever seen
单项选择题
Not only ______ properly, but that cooker is dangerous because of all those loose wires at the back.
A．does it not work
B．it works not
C．it doesn't work
D．doesn't work it
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