问题补充：
—Mike invited us to take part in the party this Sunday.
— Is this Sunday his wedding anniversary(结婚纪念日)?
A. Why not?
B. That’s all right.
C. What for?
D. What a good idea!
答案：
A. Why not?
B. That’s all right.
(答案→)C. What for?
D. What a good idea!
解析：四个选项分别表示为什么不、不用谢、为什么和多好的一个注意啊，可知C为最佳答案，为什么？这个星期日是他的结婚纪念日吗？
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