having done是什么时态?
问题描述：
having done是什么时态?
做了很多这类题 如 I regret---C----so much time on video games,A to waste B for wasting C having wasted D at wasting 选项都是一个是TO DO 另几个 DO ,HAVING DONE ,DOING.
答
regret doing sth 是固定句式,而看了太多影视游戏什么的都是过去做的,已完成的动作,所以应该是have done,两个意思组合在一起,就是regret having done~