单项选择题

A． What’s there
B． Can I help you
C． No trouble.
D． Thank you very much.
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单项选择题
A． Yes, please.B． No problem.C． Don’t worry.D． Thank you.
A． Yes, please.
B． No problem.
C． Don’t worry.
D． Thank you.
单项选择题
A． Why notB． I see.C． I don’t think so.D． Go ahead.
A． Why not
B． I see.
C． I don’t think so.
D． Go ahead.
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