单项选择题

Taking more exercise will prevent you ______ weight.

A．to put up
B．putting up
C．to put on
D．putting on
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单项选择题
They were at work when they received ______ SOS from ______ school, and they immediately started their police cars.
A．the, the
B．a, a
C．an, a
D．the, a
单项选择题
The middle-aged lady surrounded by the masses is said ______ a ______.
A．to be, main
B．being, main
C．to be, chief
D．being, chief
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