单项选择题

Questions 1 to 4 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 often is the bus scheduled to pass their stop

A．Every 21 minutes.
B．Every hour.
C．Every 30 minutes.
D．Every 9 minutes.

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单项选择题

单项选择题

Questions 1 to 4 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 often is the bus scheduled to pass their stop 您的浏览器不支持 audio 元素。