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
Silver is the best conductor of electricity, copper ______ it closely.
A．followed
B．following
C．to follow
D．being followed
单项选择题
She ______ crying very helpful to express her sadness.
A．considers
B．confirms
C．believes
D．pretends
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