单项选择题

They were at work when they received _______SOS from _______school, and they immediately stared their police cars.

A．the, the
B．a, a
C．an, a
D．the, a
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单项选择题
The reason _______he explained is not I expected.
A．for, that
B．why, that
C．that, what
D．what, that
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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