―I'msorry，butsmokingisnotallowedinthissectiononthetrain...

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】

知识点：一般过去时及其被动式

题型：选择题