【单选题】As it turned out to be a small house party, we ______ so formally.
B.
did not need have dressed up
D.
needn't have dressed up
【单选题】As it turned out to be a small house party, we so formally.
B.
did not need have dressed up
C.
did not need to dress up
D.
needn’t have dressed up
【单选题】企业必须建立质量保证系统,同时建立完整的( ) ,以保证系统有效运行。
【多选题】极性液体和极性固体介质中的损耗主要包括()
【单选题】As it turned out to be a small party in the house, we______so formally.
B.
did not need have dressed up
D.
needn't have dressed up