单项选择题

He insisted that she ______ improve her oral English 'by doing a lot of practice.

A．could
B．would
C．might
D．should
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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
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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