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16.In manufacturing,cheaper materials are constantly beingsubstituted(替代)for the better,more expensive kind.

分析 在制造业,廉价的材料不断被更好更贵的(材料)取代.

解答 substituted.考查被动语态.substitute A for B是英语的固定搭配"用A代替B",.本句用的是现在进行时的被动语态,所以答案填substituted.

点评 被动语态由"助动词be+及物动词的过去分词"构成.被动语态的时态变化只改变be的形式,过去分词部分不变.疑问式和否定式的变化也如此.掌握各种时态的被动语态是解题的关键.

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