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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 --凯瑟琳,我已经帮你打扫了房间.
--谢谢,你本不必.我自己能打扫.

解答 答案是A.本题考查"情态动词+have done"的结构.对过去的或已经发生的事件的说明往往用"情态动词+have done"的结构,由第一句可知事件已经发生,所以用"情态动词+have done"的结构,排除B和C.shouldn't have done是虚拟语气,表示"本不应做但事实上却做了";needn't have done 表示"本不必做实际上做了";根据句意,你"本不必"为我打扫房间,故答案选择A.

点评 在掌握虚拟语气的规则的基础上,判断题干属于什么类型的虚拟,然后根据语境,选用恰当的动词形式表达虚拟.

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