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(dòng)詞和虛擬語(yǔ)氣。句意：結(jié)果是一個(gè)小的家庭聚會(huì)，我們本可不必穿得這么正式。B項(xiàng)中的need不是情態(tài)動(dòng)詞；needn’t have done本不必做某事（實(shí)際上卻做了）。故選D。
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