单项选择题

Questions 14-17 are based on the following dialogue between classmates about their presentation. You now have 20 seconds to read Questions 14-17. What are the students doing when the man arrives in the class

A．Having a class discussion.
B．Giving presentations.
C．Drawing graphs.
D．Taking an exam.

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Questions 14-17 are based on the following dialogue between classmates about their presentation. You now have 20 seconds to read Questions 14-17. What are the students doing when the man arrives in the class 您的浏览器不支持 audio 元素。