—I need to advertise for a roommate for next term.—? Mary is interested.A. What forB. Why

问题补充：

—I need to advertise for a roommate for next term.

—? Mary is interested.

A. What for

B. Why not

C. So what

D. Why bother

答案：

A. What for

B. Why not

C. So what

(答案→)D. Why bother

解析：句意：——我需要登广告找个下个学期的合租者。——费那个劲做什么？玛丽对此事感兴趣。Why bother何必多此一举；Why not为什么不；So what那又怎么样呢； What for 为什么。