单项选择题

Silver is the best conductor of electricity, copper ______ it closely.

A．followed
B．to follow
C．following
D．is following
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单项选择题
You'd better, I think, ______ him a hand when necessary.
A．give
B．to give
C．gave
D．giving
单项选择题
Follow your doctor's advice, ______ your cough will get worse.
A．or
B．and
C．then
D．so
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