问题补充：
–The floor is dirty. Can anyone clean it?
–I do it all the time.
A. Don’t mention it.
B. Why you?
C. Not sure
D. Not me again.
答案：
A. Don’t mention it.
B. Why you?
C. Not sure
(答案→)D. Not me again.
解析：Don’t mention it.一般用对 Thank you.的回答。B、C语意不符，选D，意为：不能再是我了，老是我打扫。
