— Catherine, I have cleaned the room for you.
— Thanks. You ______ it. I could manage it myself.
A．needn’t doB．needn’t have done
C．mustn’t doD．shouldn’t have done
B
根據(jù)句意可知Catherine對(duì)對(duì)方為她打掃了房間表示感謝并提到對(duì)方本來不必為她打掃房間。很顯然對(duì)方打掃房間是過去所為，表達(dá)“去不必做某事”用needn’t have done sth.
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