单选题：The underlined word "this" in the second paragraph refers to

题目内容：
The underlined word "this" in the second paragraph refers to the change that A．each nail could be taken the place of by every other nail
B．each nail was exactly like every other nail
C．producing tasks became smaller and smaller
D．goods could be mass produced

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分类：公共英语三级  题型：单选题
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