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 is the main topic of this conversation

A．Lunch.
B．An exam.
C．A class.
D．A trip.

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Questions 17-20 are based on the following dialogue. You now have 20 seconds to read Questions 17-20. What is the main topic of this conversation 您的浏览器不支持 audio 元素。