题目内容
— Catherine, I have cleaned the room for you.
— Thanks. You ______ it. I could manage it myself.
— 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
根据句意可知Catherine对对方为她打扫了房间表示感谢并提到对方本来不必为她打扫房间。很显然对方打扫房间是过去所为，表达“去不必做某事”用needn’t have done sth.
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