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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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