—Catherine,Ihavecleanedtheroomforyou.  —Thanks.You

问题详情：

 —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

【回答】

B

知识点：虚拟语气与情态动词

题型：选择题