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In manufacturing, cheaper materials are constantly being        for the better, more expensive kind.

A.maintained B.cancelled C.substituted D.deposited 

C

解析试题分析:A. maintained维持,B. cancelled取消, C. substituted替换,D. deposited储蓄,寄存,放置,安置,句意:在生产中,便宜的材料被不断的替换成更好的,更贵的品种。所以选C。
考点:考查动词辨析

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