单项选择题

There are two kinds of computers there, both of them are widely used today.

A．there
B．them
C．widely
D．used
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单项选择题
As no one in the small village knew nothing about Medicine, Mrs. Smith, a former nurse, had to work as a doctor.
A．knew
B．nothing
C．had to
D．as
单项选择题
Your experiment reports must be checked with care before
A．handed them in
B．them handing in
C．being handed in
D．handing them in
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