根据各组对话内容，从下面方框里提供的5个选项中选出能填入空白处的最佳选项，并将该选项前的字母填写在答题卡相应的位置上。A: I wish I could have my money back.B: So soon!C: Of course.D: What"s the matterE: Sorry, I didn"t notice that. A: ______ B: I"ve got a headache. I stayed up late last night.