单项选择题

It is necessary that a person ______ exercises every day if he wishes to be healthy.

A．do
B．does
C．did
D．must do
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单项选择题
Between 2001 and 2011, the number of overseas visitors expanded ______ 55%.
A．by
B．for
C．on
D．in
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
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