题目内容
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】
试题分析：句意：直到他考试失败了，他才意识到他没有碰书本。Not until+时间状语从句，放在句首的时候，后面的主句用部分倒装，助动词放在谓语前面，因为realize是发生在fail后面，不是前面，不能用过去完成时，用一般过去式，选A。
考点：考查倒装句
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