摘要： He didn’t pass the exam. He regretted harder. A. not having worked B. having not worked C. to have not worked D. not to work
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He didn't pass the exam. He regretted ____ harder.
[ ]
A. not having worked
B. having not worked
C. to have not worked
D. not to work
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B. having not worked
C. to have not worked
D. not to work