题目内容：

it _hard when you leave home
Awill be raining
B will have been raining
C will be rained
D will have rained
I would have come sooner ,but I ——that you were waiting.
didn't know 还是 hadn't known?
求详细解释!

优质解答

第一题选A,表示将来一个时间点发生的事情,用将来进行时.
第二题选hadn't known,know这个动作发生在wait之前,应该是过去的过去,用过去完成时.

追问：

可是第二题的答案是didn't know；