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Not until he failed the exam _______he had left his books untouched .

A. did he realize  B. had he realized            C. he realized           D. he had realized

 

【答案】

A

【解析】

試題分析：句意：直到他考試失敗了，他才意識到他沒有碰書本。Not until+時間狀語從句，放在句首的時候，后面的主句用部分倒裝，助動詞放在謂語前面，因為realize是發(fā)生在fail后面，不是前面，不能用過去完成時，用一般過去式，選A。

考點：考查倒裝句

 

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