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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单项选择题
He ______unwisely, but he was at least trying to do something helpful.
A．may have acted
B．must have acted
C．should act
D．would act
单项选择题
The letter seemed ______ by a child.
A．to have written
B．to write
C．to be writing
D．to have been written
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