单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．They were classmates in college.
B．They see each other occasionally.
C．They went to high school together.
D．They were very close in school.

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问答题

Questions 19 to 21 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。