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
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题目内容：
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
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