英语完成时态题,

题目

英语完成时态题,
这道英语语法题,I have always regretted___ harder at school.
A.not having studied B.having not studied C.not studying D.studying not

答案

C.not studying,个人觉得是这个,因为regret加doing是固定搭配.否定是把not 放在动词前.前面已经用到过去完成时,所以后面不再重复.