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
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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
单项选择题
Farmers are allowed to grow small gardens of their own and they sell their vegetables ______ the black market.
A．on
B．at
C．in
D．for
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