As it turned out to be a small house party, we ______ so formally.A、needn’t dres

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

选项 A、needn’t dress up
B、did not need dress up
C、did not need have dressed up
D、needn’t have dressed up

答案 D

解析句子大意为：早知道是一个小型聚会，我们就不用穿得这么正式了。本题考查虚拟语气和助动词的用法。原因状语从句中为过去式，故主句应使用完成时态。need既可以做实义动词，用法为need to do sth．，又可以做助动词，直接加否定词not。所以，正确答案是D。

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