单选题 As it turned out to be a small house party, we ＿＿＿＿＿＿＿＿＿＿＿ so formally. 的答案

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题目内容：
As it turned out to be a small house party, we ＿＿＿＿＿＿＿＿＿＿＿ so formally.
题目选项

did not need have dressed up

did not need to dress up