In manufacturing, cheaper materials are constantly being        for the better, more expensive kind.
A．maintainedB．cancelledC．substitutedD．deposited
C

試題分析：A. maintained維持，B. cancelled取消， C. substituted替換，D. deposited儲(chǔ)蓄，寄存，放置，安置，句意：在生產(chǎn)中，便宜的材料被不斷的替換成更好的，更貴的品種。所以選C。
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