单项选择题

It is kind ______ you to do me a favor at this moment.

A．to
B．for
C．of
D．about
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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
Silver is the best conductor of electricity, copper ______ it closely.
A．followed
B．following
C．to follow
D．being followed
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