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—Catherine, I have cleaned the room for ...

—Catherine, I have cleaned the room for you.

—Thanks, you __________it. I could manage it myself.

A.needn’t do

B.needn’t have done

C.mustn’t do

D.shouldn’t have done

 

B 【解析】本题考查情态动词.根据句意可知Catherine对对方为她打扫了房间表示感谢并提到对方不必为她打扫房间。needn’t do不需要做……;mustn’t禁止做……,都用于现在的动作;needn’t have done表示做了本来不必去做的事;shouldn’t have done是本不该做却做某事。
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