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11．What do you think is the greatestinvention（invent） of the twentieth century？

分析 你認為什么是20世紀最偉大的發(fā)明？

解答 答案：invention 根據(jù)the greatest…of可知此處需要名詞形式，所給詞invent為動詞，其名詞形式為invention，謂語動詞is為單數(shù)．故答案為：invention

點評 本題考查名詞．要根據(jù)單詞所在的位置來判斷所需要的詞性，根據(jù)所給詞進行變化．

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