I regret _____ hard at school,or I would have succeeded in passing the exam.

I regret _____ hard at school,or I would have succeeded in passing the exam.

题目
I regret _____ hard at school,or I would have succeeded in passing the exam.
选项:a、not to work b、having not worked c、to have not worked
d、 not having worked
选哪个?为什么?请分析并翻译整句
答案
D regret not having done sth 后悔没有做过什么.这种否定表达形要用not having done,而不是having not done
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