第1个回答 2008-06-23
I regret doing...很抱歉做过
I regret to do...很抱歉要做
第2个回答 2008-06-23
I'm sorry that I've done ...
第3个回答 2008-06-23
1. be/feel sorry to have done sth
2. regret doing sth
3. regret having done sth
第5个回答 2008-06-23
be sorry to have done sth.本回答被提问者采纳