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
I don't know about him, ______ comment on him behind his back.
A．let alone
B．let go
C．leave alone
D．take leave
单项选择题
I just met her ______ on the way home from the bookstore.
A．on purpose
B．by accident
C．in accident
D．in case
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