题目内容：

Not until then （ ）that he was wrong.A he realized B he did realize C did he realize D had he realized
这里的各个选项详解

优质解答

这一题考查的是否定词前置,要部分倒装的知识点.因为Not是否定词,所以助动词要放在主语之前,答案只能是C或D；那么,究竟是用过去时还是过去完成时呢?这句话如果不用倒装,正常语序应该是：He hadn't realized that ...