It was very kind of you to do the washing up yesterday but you______it.A.mustn"tB.wouldn"

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It was very kind of you to do the washing up yesterday, but you______it.

A.mustn"t

B.wouldn"t have done

C.mightn"t have done

D.needn"t have done

请帮忙给出正确答案和分析,谢谢!

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