单项选择题

Questions 22 to 25 are based on the conversation you have just heard.

A．We should blame external factors.
B．We should blame internal factors.
C．We should blame others.
D．We needn’t blame ourselves.

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单项选择题

Questions 22 to 25 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。