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

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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 根据前一分句中的turn out to be...“到后来才发现”,可知说话者事先并不知情,所以事实上穿得很正规,need not have done结构表示“本没必要”,符合题意,故A为答案。C项didn’t need to do表示在过去没必要做某事,并且事实上也没有做,故不对;must not常表示“不准”。B、D都不正确。
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