单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．An employee’s age.
B．An employee’s loyalty.
C．An employee’s performance.
D．An employee’s length of service.

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单项选择题

Questions 19 to 22 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。