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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