-----Who has made a mess in my room?
-----Who else it but your naughty son?
A. could do
B. could have done
C. did
D. had done
网友回答
A. could do
(答案→)B. could have done
C. did
D. had done
解析：考查情态动词用法。Could have done 可能做某事；是对过去所发生事情的推测。句意：—谁把我的房间弄乱的？—除了你调皮的儿子还有谁可能做了这件事情啊？