单项选择题

Hospital doctors don't go out very often as their work takes（）their time.

A．away
B．over
C．in
D．up

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单项选择题

An iron and steel works, with several satellite factories,（）in that city now.

A．is built
B．is being built
C．were built
D．are being built

单项选择题

The police knew nothing about the case（）your father phone them.

A．after
B．since
C．as
D．until

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