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13．----Catherine，I have cleaned the room for you．（　�。�
----Thanks，you ___ it．I could manage it myself．
A．needn't have doneB．don't need to do
C．needn't doD．shouldn't have done

分析 --凱瑟琳，我已經幫你打掃了房間．
--謝謝，你本不必．我自己能打掃．

解答 答案是A．本題考查"情態(tài)動詞+have done"的結構．對過去的或已經發(fā)生的事件的說明往往用"情態(tài)動詞+have done"的結構，由第一句可知事件已經發(fā)生，所以用"情態(tài)動詞+have done"的結構，排除B和C．shouldn't have done是虛擬語氣，表示"本不應做但事實上卻做了"；needn't have done 表示"本不必做實際上做了"；根據句意，你"本不必"為我打掃房間，故答案選擇A．

點評 在掌握虛擬語氣的規(guī)則的基礎上，判斷題干屬于什么類型的虛擬，然后根據語境，選用恰當?shù)膭釉~形式表達虛擬．

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