—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
句子的語(yǔ)境是：“我自己能做”，所以“你本不必做的”。選A還是B呢？根據(jù)前面一句中的 have cleaned 可知，動(dòng)作已經(jīng)發(fā)生，所以此處談?wù)摰氖且粋�(gè)過(guò)去情況，故選 needn’t have done。
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