◎ 题干
— Cathy, I have cleaned the room for you.
— Thanks. You _____ it. I could manage it myself.  
[     ]
A. didn't need to do   
B. needn't have done  
C. mustn't do      
D. shouldn't have done
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“— Cathy, I have cleaned the room for you.— Thanks. You _____ it. I could manage it myself.[ ]A. didn't need to do B. needn't have doneC. mustn't do D.…”主要考查了你对  【情态动词】【现在完成时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。