单项选择题

Questions 13 to 15 are based on the conversation you have just heard.

A．He was studying.
B．He was making noises.
C．He was nodding off.
D．He was looking for a book.

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单项选择题

Questions 13 to 15 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。