I regret( )that I'm unable to help you.A.saying B.to say C.say D.said

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Iregret()thatI''munabletohelpyou.A.sayingB.tosayC.sayD.saidIregret()thatI''munabletohelpyou.A.sayingB.

I regret( )that I'm unable to help you.A.saying B.to say C.say D.said
I regret( )that I'm unable to help you.A.saying B.to say C.say D.said

I regret( )that I'm unable to help you.A.saying B.to say C.say D.said
选B.
regret to do sth,遗憾/后悔做某事(未做或将要做)
regret have done sth,遗憾/后悔做某事(已做)
根据题意可以判断,“我很遗憾地告诉你,我帮不了你”……你说选什么.