单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A. Husband and wife.
B. Doctor and patient.
C. Customer and clerk.
D. Teacher and student.

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单项选择题

单项选择题

Questions 19 to 22 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。