单项选择题

-- ______ are your parents -- They are both teachers.

A．Who
B．Whom
C．What
D．Which
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单项选择题
Be quiet! It's rude to ______ people when they are talking.
A．stop
B．introduce
C．prevent
D．interrupt
单项选择题
-- Sorry, Joe. -- Don't call me Joe , I'm Mr. Parker to you, and ______ you forget it!
A．do
B．didn't
C．did
D．don't
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