单项选择题

Questions 11 to 14 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now, listen to the passage. How long does the training period last

A．Two to four months.
B．About three weeks.
C．At least half a year.
D．Two years or mor

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单项选择题

单项选择题

Questions 11 to 14 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. How long does the training period last 您的浏览器不支持 audio 元素。