-----Who has made a mess in my room?
-----Who else         it but your naughty son?
A．could doB．could have doneC．didD．had done
B
考查情態(tài)動(dòng)詞用法。Could have done 可能做某事；是對(duì)過去所發(fā)生事情的推測。句意：—誰把我的房間弄亂的？—除了你調(diào)皮的兒子還有誰可能做了這件事情��？
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