单项选择题

We have ______medical service.

A．priceless
B．free charge
C．no charge
D．free
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单项选择题
By the year 2000, production in the area is to double ______ of 1990.
A．that
B．it
C．one
D．what
单项选择题
By ______computation, he estimated that the repairs on the house would cost him a thousand dollars.
A．coarse
B．rude
C．rough
D．crude
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