题目内容
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
天天向上一本好卷系列答案
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