单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now, listen to the conversation.
How much time do the man and woman have before they address the class

A．Less than ten minutes.
B．About twenty minutes.
C．Forty-five minutes.
D．Over an hour.

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单项选择题

单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now, listen to the conversation. How much time do the man and woman have before they address the class 您的浏览器不支持 audio 元素。