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

分析 你认为什么是20世纪最伟大的发明?

解答 答案:invention 根据the greatest…of可知此处需要名词形式,所给词invent为动词,其名词形式为invention,谓语动词is为单数.故答案为:invention

点评 本题考查名词.要根据单词所在的位置来判断所需要的词性,根据所给词进行变化.

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