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
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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
单项选择题
To our surprise, the stranger _____________ to be an old friend of my mother's.
A．turned into
B．turned out
C．turned over
D．turned up
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