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
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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
单项选择题
That tree looked as if it ______ for a long time.
A．hasn't watered
B．didn't water
C．hadn't been watered
D．wasn't watered
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