单项选择题

Questions 14-17 are based on the following dialogue What are the students doing when the man arrives in class

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

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单项选择题

单项选择题

Questions 14-17 are based on the following dialogue What are the students doing when the man arrives in class 您的浏览器不支持 audio 元素。