单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．The class thought the demonstration was too complex.
B．Too many students showed up.
C．The professor didn’t show up.
D．The professor cancelled it.

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单项选择题

单项选择题

Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。