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

正如我們所知道的，偉大的科學(xué)成就緣于多年努力去創(chuàng)造某些以前不存在的東西。

2. that has never existed定語從句中的謂語動(dòng)詞的單復(fù)數(shù)須與that所修飾的名詞或代詞一致。此句先行詞是something  

題目來源：高考英語組合訓(xùn)練多項(xiàng)選擇+完成句子 > 組合訓(xùn)練13-14

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