单项选择题

The government _____ the effect of the pollution.

A．have well aware of
B．well be aware of
C．was well aware of
D．well have aware of
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单项选择题
He was praised for _____ a great contribution to his country.
A．making
B．having made
C．have made
D．make
单项选择题
He will participate _____ the coming Jazz festival.
A．on
B．at
C．with
D．in
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