单项选择题

Running slowly for some three miles every day is proved a good form of exercise.

A．some
B．is proved
C．form
D．exercise
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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
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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