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
Many a young scientist ______ engaged in the research work.
A．have
B．has
C．have been
D．has been
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
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