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. Why were these Chinese sorely needed at this time

A．The work was strenuous.
B．The work was dangerous.
C．The railroad company couldn’t find other laborers for the job.
D．All of the above.

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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. Why were these Chinese sorely needed at this time 您的浏览器不支持 audio 元素。