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单项选择题

A.Having a class discussion.B.Giving presentations.C.Dr……

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.