单项选择题

Questions 5 to 7 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions.
Now listen to the conversation.
How long did the trial last

A．Two years.
B．Three years.
C．Four years.
D．Five years.

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单项选择题

单项选择题

Questions 5 to 7 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions. Now listen to the conversation. How long did the trial last 您的浏览器不支持 audio 元素。