语法题.Only after i read the text over again did i knew its main ide_英语解答

语法题.Only after i read the text over again did i knew its main idea.
did i knew 不能换成could i know 么.

人气：444 ℃　时间：2019-10-14 05:07:05

解答

可以- - 没有理由么。只要语法是对的，，只是个时态的问题