单项选择题

Many unexpected problems have been arisen in the course of the reconstruction of the city.

A．Many
B．have been
C．course
D．of the city
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There are two kinds of computers there, both of them are widely used today.
A．there
B．them
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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
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