--Beg your pardon, please.I didn't quite catch what you said.---Oh, I to myself.A. had ta

--Beg your pardon, please.I didn't quite catch what you said.---Oh, I to myself.
A. had talked
B. talking
C. talked
D. was talking

A. had talkedB. talkingC. talked(答案→)D. was talking解析：对方没听清楚，请求我把刚才的话再说一次。我答时说：哦，我那时在自言自语啊！说明对方没听清楚的原因。

谢谢了