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
______ this big sum of money and all the research efforts, we are likely to develop laser weapons for use in space.
A．Taking into consideration
B．Taking into account
C．Given
D．Providing that
单项选择题
I tend to ______ those who crack themselves up(自吹自擂).
A．look through
B．look down upon
C．look back
D．look on
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