单项选择题

They come from different ______

A．country
B．countries
C．a country
D．countrys
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单项选择题
-- Have you ______ some new ideas -- Yeah. I'll tell you later.
A．come about
B．come into
C．come up with
D．come out with
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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