单项选择题

It is well known that ______ doctors are badly needed in the hospital.

A．a
B．an
C．the
D．×
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单项选择题
You will get ______ going and none will be left at home.
A．three of them
B．three them
C．the three of them
D．some of them
单项选择题
The stones ______ houses and bridges.
A．are used to build
B．used to build
C．are used to building
D．used to building
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