单项选择题

To obtain a satisfactory result, one must apply two ______ of paint on a clean surface.

A．coats
B．levels
C．times
D．courses
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单项选择题
We looked for a table to sit down, but they were all ______.
A．reserved for
B．engaged in
C．used up
D．taken up
单项选择题
He wrote the book in ______ with his wife.
A．proportion
B．installment
C．correspondence
D．collaboration
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