Asitturnedouttobeasmallhouseparty,we

問題詳情：

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

   A. couldn’t have dressed up            B. shouldn’t dress up

   C. mustn’t have dressed up             D. needn’t have dressed up

【回答】

D

知識點：虛擬語氣與情態動詞

題型：選擇題