As it turned out to be a small party in the house, we______so formally.A.needn"t dress upB
As it turned out to be a small party in the house, 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
请帮忙给出正确答案和分析,谢谢!