单项选择题

By the time we hurried through the heavy traffic to the airport, the plane ______.

A．was taking off
B．would take off
C．had taken off
D．took off
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单项选择题
Exceeding speed limits and ______ safety belts are two common causes of automobile death.
A．not having worn
B．not to wear
C．failing to wear
D．don't wear
单项选择题
The company' s employment policy makes it clear that men and women have ______ opportunities.
A．equivalent
B．equal
C．identical
D．balanced
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