As it turned out to be a small party in the house we______so formally.A.needn"t dress upB

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As it turned out to be a small party in the house, we______so formally.

A.needn"t dress up

B.did not need have dressed up

C.did not need dress up

D.needn"t have dressed up

请帮忙给出正确答案和分析,谢谢!

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