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  3. 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.

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问题 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
答案D
解析 reyret to do意为“遗憾要去做……”；regret doing意为“后悔做了……”根据句意可知，这里表示已经发生的事情，所以应用动名词的完成式。动名词的否定式是在其前加not。故选D。
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