问题
选择题
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
答案
答案：A
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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
答案：A