【题目】--- Do you think I should join the singing group, Mary?
--- ______ If I were in your shoes, I certainly would.
A. None of your business． B. It depends.
C. Why not? D. I don’t think so.
在线课程【答案】C
【解析】考查交际用语。根据回答可知：第二个人赞成他加入这个唱歌团体，故用why not，为什么不呢？