问题详情：
―I'm sorry，but smoking is not allowed in this section on the train．
―Oh，I __________ that，and l won't again．
A．don't know B．didn't know C．won't D．haven't known
【回答】
B知识点：一般过去时及其被动式
题型：选择题
―I'msorry，butsmokingisnotallowedinthissectiononthetrain...
词海录
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