单项选择题

I wonder if I can ask him ______ time.

A．four
B．fourth
C．the fourth
D．a fourth
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单项选择题
Such electronic devices ______ are used in a radio set are also found in a computer.
A．which
B．that
C．what
D．as
单项选择题
We can not use the bridge now, because it ______.
A．has been repaired
B．is repairing
C．is repaired
D．is being repaired
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