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

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

题型:不详难度:来源:
Not until he failed the exam _______he had left his books untouched .
A.did he realizeB.had he realizedC.he realizedD.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。
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