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(yǔ)從句中的謂語(yǔ)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(lái)源:高考英語(yǔ)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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6. ―You were out when I dropped in at your house.

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——我去拜訪你時(shí)你不在家。

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我們剛到鄉(xiāng)間就下雨了。

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練完了小提琴,這個(gè)女孩開(kāi)始幫她媽媽建立博客。 

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他還是一個(gè)小寶貝的時(shí)候就被父母帶到外國(guó)去了,信中說(shuō)還有五周他才從英國(guó)回來(lái)。

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如果他們努力工作的話,他們現(xiàn)在會(huì)非常累。

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要自殺的那個(gè)人拒絕出來(lái),所以警察只能破門而入去救他。

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