【題目】—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

【答案】B

【解析】試題分析：句意：—凱瑟琳，我已經(jīng)給你打掃了房間。—謝謝。你本來沒有必要打掃的，我自己能夠?qū)Ω丁?/span>needn’t have done：過去本來沒有必要做而做了；shouldn’t have done：過去本來不應(yīng)該做而做了。故選B

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