I felt sorry that i () (help) her that time .括号里是用did not 还是could not?

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I felt sorry that i () (help) her that time .括号里是用did not 还是could not?

I felt sorry that i () (help) her that time .括号里是用did not 还是could not?
I felt sorry that i () (help) her that time .括号里是用did not 还是could not?

I felt sorry that i () (help) her that time .括号里是用did not 还是could not?
did not 表示确实发生的事情(没有帮)
could not help表示虚拟语气,原句可写为I felt sorry that I could help her that time.

看表达什么意思咯,did not表示:我很抱歉我没有帮她,其实是能帮上她的。could not表示:我很遗憾我帮不了她,实际上市真的帮不上她

用did not

didn't