问题补充：
----I’m sorry to have kept you waiting.
----
A. You are welcome
B. Go ahead
C. Don’t mention it
D. No problem
答案：
A. You are welcome
B. Go ahead
C. Don’t mention it
(答案→)D. No problem
解析：-I’m sorry的回答有No problem，it doesn’t matter，it’s ok，it’s all right，never mind
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