As it turned out to be a small house party, we______so formally. (1996年考试真题)A、ne

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问题 As it turned out to be a small house party, we______so formally. (1996年考试真题)

选项 A、need not have dressed up
B、must not have dressed up
C、did not need to dress up
D、must not dress up

答案 A

解析 本题考点为need not have done,表示“过去本不必做而实际上做了”。
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