As it turned out to be a small house party, we        so formally.
A．needn’t dress upB．did not need have dressed up
C．did not need to dress upD．needn’t have dressed up
D

試題分析：考查情態(tài)動詞和虛擬語氣。句意：結果是一個小的家庭聚會，我們本可不必穿得這么正式。B項中的need不是情態(tài)動詞；needn’t have done本不必做某事（實際上卻做了）。故選D。
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