单项选择题

[听力原文]
W: We have made ten copies.
M: At first it’s planned to need ten copies, and now we don’t need so many. Four would be enough.
How many unnecessary copies they have made（）

A．Five.
B．Three.
C．Four.
D．Six.

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[听力原文] W: We have made ten copies. M: At first it’s planned to need ten copies, and now we don’t need so many. Four would be enough. How many unnecessary copies they have made（） 您的浏览器不支持 audio 元素。