单选 I'm sorry that I _____ you were here.

问题描述:

单选 I'm sorry that I _____ you were here.
A didn't know
B don't know
这两个答案是不是都可以呢?

这题选择A答案,答案唯一
说这句话的时候说话人已经知道这人在这了,所以这里用过去时表示先前不知道.类似的还有:
I didn't recognize you.高二课本中的句子
提醒:这题和虚拟语气无关!