I regretted ( ) the days when I ( ) hard at school.备选：wasting ;mu_英语解答

I regretted ( ) the days when I ( ) hard at school.备选：wasting ;must have worked
/having;wasted should have worked
备选：wasting ;must have worked 或 having;wasted should have worked

人气：161 ℃　时间：2020-09-07 17:07:46

解答

I regretted having wasted the days when i should have worked hard at school.为什么这么填？怎么翻译呀？谢谢！regret doing sth have done sth, 完成时，已经发生的should have done sth,虚拟语态，表示应该做了某事，可是没做我后悔当初在学校浪费了那么多天，我本应该好好学习来着，（可是我没有）