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
D
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科目：初中英語 來源：湖北省同步題 題型：單選題

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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