—Honey, I have cleaned the windows for you. —Thanks a lot. But you______it.

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问题 —Honey, I have cleaned the windows for you. —Thanks a lot. But you______it.

选项 A、needn’t do
B、needn’ t have done
C、mustn’t do
D、shouldn’ t have done

答案B

解析句意：一亲爱的，我已经给你擦过窗户了。一非常感谢。你本来可以不用做的。很显然擦窗户是发生在过去的事，表示“过去不必做某事”用needn’t have done sth．来表达。所以本题的答案选B。

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