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

分析 在制造業(yè)，廉價的材料不斷被更好更貴的（材料）取代．

解答 substituted．考查被動語態(tài)．substitute A for B是英語的固定搭配"用A代替B"，．本句用的是現在進行時的被動語態(tài)，所以答案填substituted．

點評 被動語態(tài)由"助動詞be+及物動詞的過去分詞"構成．被動語態(tài)的時態(tài)變化只改變be的形式，過去分詞部分不變．疑問式和否定式的變化也如此．掌握各種時態(tài)的被動語態(tài)是解題的關鍵．

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