—Catherine, I have cleaned the room for ...

—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

B 【解析】试题分析：句意：—凯瑟琳，我已经给你打扫了房间。—谢谢。你本来没有必要打扫的，我自己能够对付。needn’t have done：过去本来没有必要做而做了；shouldn’t have done：过去本来不应该做而做了。故选B 考点：情态动词

考点分析：

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