2. 外语
  3. As it turned out to be a small house party, we ______so formally.

As it turned out to be a small house party, we ______so formally.

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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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