单项选择题

Questions 17—20 are based on the following dialogue. You now have 20 seconds to read Questions 17—20. What’s the possible relationship of the two speakers

A．Doctor and patient.
B．Teacher and student.
C．Husband and wife.
D．Shopkeeper and customer.

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单项选择题

单项选择题

Questions 17—20 are based on the following dialogue. You now have 20 seconds to read Questions 17—20. What’s the possible relationship of the two speakers 您的浏览器不支持 audio 元素。