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 long have they been waiting

A．Not long.
B．For more than haft an hour.
C．For a few minutes.
D．Several hours.

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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 long have they been waiting 您的浏览器不支持 audio 元素。