—— I’m sorry, but there’s no smoking room in this section on the train.
—— Oh, I ___________that, and I won’t smoke again.
| A．don’t know | B．won’t know | C．didn’t know | D．haven’t known |
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—— I’m sorry, but there’s no smoking room in this section on the train.
—— Oh, I ___________that, and I won’t smoke again.
| A．don’t know | B．won’t know | C．didn’t know | D．haven’t known |
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