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

試題分析:考查虛擬語氣。根據(jù)As it turned out to be中的過去時(shí),說明這是與過去的事實(shí)相反的虛擬語氣,故使用“情態(tài)動(dòng)詞+have done”的形式。Needn’t have done本不需要做某事實(shí)際上卻做了。句意:正如結(jié)果所顯示的那樣,這是一個(gè)小型的家庭聚會(huì),我們本不必要穿得如此的正式的。故D正確。
點(diǎn)評:與過去的事實(shí)相反的虛擬語氣,故使用“情態(tài)動(dòng)詞+have done”的形式。Needn’t have done本不需要做某事實(shí)際上卻做了。
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