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

问题描述:

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.