单项选择题

Many a young scientist ______ engaged in the research work.

A．have
B．has
C．have been
D．has been
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单项选择题
The plan had been ______ , which made him very angry.
A．called off
B．called up
C．called in
D．called on
单项选择题
He was found ______ one month after he was born.
A．quiet
B．still
C．silent
D．dumb
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