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
Jenny was still running temperature, so she had to _____________ work.
A．leave alone
B．leave behind
C．leave off
D．leave out
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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