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-----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?
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