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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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科目:初中英语 来源:湖北省同步题 题型:单选题

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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