单选题 As it turned out to be a small house party, we ________ so formally.
  • A. needn't dress up
  • B. did not have dressed up
  • C. did not need dress up
  • D. needn't have dressed up


【正确答案】 D
【答案解析】[妙翻巧译] 那个聚会原来是个小型的家庭聚会，我们原本不必穿得那么正式。
[解析] needn't have+过去分词表示过去本来不是必须要做但已经做了的事。