单项选择题

The railway station is within ______ drive from here.

A．three hours
B．three-hours
C．three-hour
D．three hour-long
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单项选择题
A computer ______ think for itself. It must be told what to do.
A．can't
B．couldn't
C．may not
D．might not
单项选择题
The doctor insisted that he ______ seriously ill and that he ______ operated on immediately.
A．be; should be
B．was; be
C．was; must be
D．should be; should be
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