As it turned out to be a small house party, we ______ so formally.A、need not hav

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问题 As it turned out to be a small house party, we ______ so formally.

选项 A、need not have dressed up
B、must not have dressed up
C、did not need to dress up
D、must not dress up

答案 A

解析在这个句子中，句意表达的意思是：不必要做某事，但事实上却做了某事。在题目提供的四个选项中，needn’t have done表示“过去不必做某事，但事实上却做了”。所以，答案是A。

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