单项选择题

Computers are already widely used in industry and in universities and the time may come when it______ possible for ordinary people to use them as well.

A．is
B．will be
C．must be
D．may be
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单项选择题
The doctor ordered the patient to______ all solid food for at least twenty-four hours.
A．keep out
B．keep away
C．keep off
D．lay aside
单项选择题
He said it was impossible for______ a mistake in a computer' s calculation, so you can rely on that.
A．there being
B．there would be
C．there to be
D．there was
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