单项选择题

You cannot see the patient at the moment; he is now ______ medical treatment.

A．in
B．on
C．under
D．at
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单项选择题
He ______ at the boy into silence.
A．glanced
B．observed
C．watched
D．stared
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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