单项选择题

The airplane _____________ by the time I arrive at Pudong International airport.

A．has taken off
B．will take off
C．will have taken off
D．would have taken off
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单项选择题
It is time that we _____________ computers to the productions of iron and steel.
A．applied
B．will apply
C．have applied
D．would have applied
单项选择题
It is during her spare time _____________ Jenny has been studying computer programming.
A．when
B．which
C．what
D．that
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