◎ 题干
The machines which ______ in this exhibition are used ______ producing different kinds of paper.
[     ]
A. are shown; to
B. shown; to
C. shown; for
D. are shown; for
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“The machines which ______in this exhibition are used ______producing different kinds of paper.[ ]A. are shown; to B. shown; toC. shown; for D. are shown;…”主要考查了你对  【被动语态】【介词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。