题目内容
【题目】They failed to finish the project before the deadline. I regretted __________.
A. to be not able to help B. being not able to help
C. being unable to help D. not to be able to help
【答案】C
【解析】句意:他们没能在截止日期前完成这个项目,我后悔没能帮助他们。regret doing sth. 后悔曾经做过某事。
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