单项选择题

A. Conductor and passenger. B. Teacher and student.
C. Salesman and customer. D. Boss and secretary.
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单项选择题
A. You are right. B. Yes, it is.C. No, you’re joking. D. No, it’s impossible.
A. You are right.
B. Yes, it is.
C. No, you’re joking.
D. No, it’s impossible.
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