11、―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

11、B

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―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

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