单项选择题

______ experience of working in an office environment is essentia[ for this job.

A．Prior
B．First
C．initial
D．Previous
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单项选择题
It took western companies many years to ______ from the oil crisis of the mid-70s.
A．regain
B．recover
C．retain
D．refresh
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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