问题补充：
—I’m terribly sorry to have given you so much trouble.
—
A. Don’t mention it!
B. How come?
C. That’s all right.
D. So what?
答案：
A. Don’t mention it!
B. How come?
(答案→)C. That’s all right.
D. So what?
解析：考查交际用语：A. Don’t mention it!不用谢，B. How come?怎么回事？C. That’s all right.没关系，D. So what?那又怎样？句意：很抱歉给你带来这么多的麻烦。--没关系，选C。
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