--- Catherine, I have cleaned the room for you.
---Thanks. You _______ it. I could manage it myself.
A．needn’t doB．needn’t have doneC．mustn’t do D．shouldn’t have done
B

試題分析：句意：凱薩琳，我已經(jīng)為你打掃了房間。--謝謝，你本不必這么做，我自己能行。因為房間已經(jīng)打掃過了，所以是needn’t have done本不必做而做了，A. needn’t do不必做（事實），C. mustn’t do禁止做，D. shouldn’t have done本不應(yīng)該做而做了，根據(jù)句意選B。
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