As it turned out to be a small house party, we ________so formally.A、need not ha

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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

解析情态动词与虚拟语气。need not have done表示与过去事实相反，意思是“本不需做某事的”。did not need to dress up描述的是真实的过去事件，但在意思上与此句不符。

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