单项选择题

Between 2001 and 2011, the number of overseas visitors expanded ______ 55%.

A．by
B．for
C．on
D．in
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单项选择题
It is obvious that these small businesses are ______ need of technical support.
A．in
B．on
C．with
D．to
单项选择题
I m sorry to tell you that the materials you wanted are ______.
A．taken off
B．put up
C．sold out
D．got off
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