—Who has made a mess in my room?
—Who else       it but your naughty son?
A．could doB．could have doneC．didD．has done
B
考查情態(tài)動詞用法。語境表示對過去發(fā)生并延續(xù)到現(xiàn)在的情況的推測，用could have done表示不肯定的語氣。
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