单项选择题

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