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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。
句子的語境是：“我自己能做”，所以“你本不必做的”。選A還是B呢？根據前面一句中的 have cleaned 可知，動作已經發(fā)生，所以此處談論的是一個過去情況，故選 needn’t have done。
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