根据各组对话内容，从下面提供的5个选项中选出能填入空白处的最佳选项。A:I’m so
题型：单项选择题
问题：
根据各组对话内容，从下面提供的5个选项中选出能填入空白处的最佳选项。
A:I’m sorry to have kept you waiting for so long.
B:()I’ve been killing time by listening to music.
A．Sure. What is it
B．It’s very nice of you to say so.
C．It’s nothing.
D．Have a nice trip!
E．Certainly, Here you are.