单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．He managed the sales department.
B．He gave seminars on the Internet.
C．He worked as a custodian.
D．He designed software.

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What is the topic of the passage

单项选择题

Questions 19 to 22 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。