【題目】—Catherine, I have cleaned the room for you.
— Thanks. You _______ it. I could manage it myself.
A.needn't have done
B.needn't do
C.mustn't do
D.shouldn't have done

【答案】A
【解析】考查固定用法。根據(jù)句意可知Catherine對對方為她打掃了房間表示感謝并提到對方本來不必為她打掃房間。很顯然對方打掃房間是過去所為，表達“去不必做某事”用needn't have done sth.

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