单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．That there was no effect.
B．That it improved operations.
C．That operations became less efficient.
D．That the employees became dissatisfied.

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单项选择题

单项选择题

Questions 19 to 21 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。