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

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

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

答案D

解析 本题考查情态动词,根据题中的原因状语从句意思(原来只是一个家庭聚会)的提示,可知主句应该是"我们本不必穿得如此正式",所以要用needn’t+have+过去分词的形式。
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