题目内容

Not until he failed in the last examination _________ he should have spent more time on study.
A．did he realizeB．he realizedC．did he not realizeD．he didn’t realize
A

试题分析：考查倒装句：句意：直到他在最后一次考试中失利，他才意识到他应该在学习上多花些时间。Not until引导时间状语从句置于句首，后面的主句用部分倒装，以前前面是not until，后面是肯定句，选A。
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