我突然意识到他一直以来说的都是实话。

It suddenly ___dawned ___on me that he had been telling the truth all along.

她突然意识到已经过去了这么多时间。

Suddenly it ___dawned ___on her how much time had passed.

经过多年研究，这位历史学家才意识到这一事件改变了战争的进程。

Only after years of study did it ___dawn ___on the historian that this event changed the course of the war.