单项选择题

A．at
B．in
C．of
D．by
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单项选择题
A．stillB．evenC．andD．too
A．still
B．even
C．and
D．too
单项选择题
Pupil: Sorry, Mr. Wang. I'm late. My alarm clock didn't ting.Teacher: ______
A．It doesn't matter. These things happen
B．Excuse me, sir. I never accept any apologies at all
C．Thank you. You're welcome
D．Never mind. You don't have to be so polite
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