---I need to advertise for a roommate for next term.
--- ? Mary is interested.
A. Why bother
B. Why not
C. So what
D. What for
网友回答
(答案→)A. Why bother
B. Why not
C. So what
D. What for
解析：考查交际用语。Why bother? 没有必要 Why not?为何不？ So what?那又怎样？ What for?为何目的？意思是：--我需要等广告寻找下学期的室友。--没有必要。Mary很感兴趣。