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—Catherine, I have cleaned the room for you.
—Thanks. You _________it. I could manage it myself.  
A.needn’t doB.needn’t have done
C.mustn’t doD.shouldn’t have done
B
句子的语境是:“我自己能做”,所以“你本不必做的”。选A还是B呢?根据前面一句中的 have cleaned 可知,动作已经发生,所以此处谈论的是一个过去情况,故选 needn’t have done。
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