单项选择题

-- It 'll take at least 2 hours to do this!
--Oh, ______ ! I could do it in 30 minutes.

A．come on
B．pardon me
C．you are right
D．don't mention it
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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
单项选择题
You'd better, I think, ______ him a hand when necessary.
A．give
B．to give
C．gave
D．giving
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