◎ 题干
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
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“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 …”主要考查了你对  【动名词的完成式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。