Not until he failed the exam _______he had left his books untouched .
A．did he realizeB．had he realizedC．he realizedD．he had realized
A

試題分析：句意：直到他考試失敗了，他才意識(shí)到他沒(méi)有碰書本。Not until+時(shí)間狀語(yǔ)從句，放在句首的時(shí)候，后面的主句用部分倒裝，助動(dòng)詞放在謂語(yǔ)前面，因?yàn)閞ealize是發(fā)生在fail后面，不是前面，不能用過(guò)去完成時(shí)，用一般過(guò)去式，選A。
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