As we all know,great scientific achievements are the results of years of trying to create something before 正如我们所知道的.伟大的科学成就缘于多年努力去创造某些以前不存在的东西. 题目和参考答案——青夏教育精英家教网—

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2. As we all know,great scientific achievements are the results of years of trying to create something before (exist)

正如我们所知道的，伟大的科学成就缘于多年努力去创造某些以前不存在的东西。

2. that has never existed定语从句中的谓语动词的单复数须与that所修饰的名词或代词一致。此句先行词是something

题目来源：高考英语组合训练多项选择+完成句子 > 组合训练13-14

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