As it turned out to be a small house party, we ______ so formally.
A、
needn't dress up
B、
did not need have dressed up
C、
did not need dress up
D、
needn't have dressed up
【正确答案】
D
【答案解析】
needn't have done对过去发生事情的虚拟，表“本不必要，但实际上却”之意。
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