A.一体化 B.高效化 C.舒适性 D.综合性
A.I’m awfully sorry. B.I’m very sorry about... C.I’m really sorry about… D.I’m very sorry.
A.Well,I’ve enjoyed meeting and talking with you. B.I am sorry,I really have to go. C.Well,I’d like to hear more about it,but I really have to go.I’ll call you. D.I’m sorry.I’ve got to go. E.Well,talk to you later,then.