单项选择题

The government must take some measures ______ the city's pollution.

A. to control
B. controls
C. controlling
D. to be controlled
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单项选择题
He suggested ______ the weekend with some foreign friends.
A. spend
B. spending
C. to spend

D. spent
单项选择题
Everything is in great ______ in the countries suffering from the war.
A. ask
B. requirement
C. demand

D. request
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