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．Sure．What is it? B．It’s very nice of you to say so． C．It’s nothing．

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问题根据各组对话内容，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．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．
A：I’m sorry to have kept you waiting for so long．
B：_______I’ve been killing time by listening to music．

选项 A、
B、
C、
D、
E、