They failed to pass the exam last time,i regretted_____

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/07/03 07:12:36

They failed to pass the exam last time,i regretted_____
A、to be not able to help
B、being unable to help
C、being not able to helping
D、not be able to help
选哪个为什么?

选B,regret to do 对将要做的事遗憾(未做)regret doing 对做过的事遗憾、后悔 (已做)
这个事情已经发生了.C改成being not able to help就对了.

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