I wouldn have come earlier but i ___

题目

I wouldn have come earlier but i ___
I would have come earlier but i ___that you were waiting.
A.didn't know B.wouldn't know
C.hadn't known D.haven't known
选择哪个?为什么?

答案

你先从正面的句子想I would have come earlier if i knew that you were waitingknew 的反义 就是 didn't know I would have come earlier but i (didn't know) that you were waiting.