Only then _____that I had made another mistake .But it was too late

Only then _____that I had made another mistake .But it was too late
A:did i realize B:i realized C:i was realizing D:was i realize为什么要选A呢?
其他人气:396 ℃时间:2019-10-24 02:46:08
优质解答
only then 要动词前提,类似虚拟语气的做法.所以did前提,后面用动词原型
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