butsmokingisnotallow的精选

问题详情：―I'msorry，butsmokingisnotallowedinthissectiononthetrain．―Oh，I__________that，andlwon'tagain．A．don'tknow  B．didn'tknow    C．won't       D．haven'tknown【回答】B知识点：一般过去时及其被...