一Excuse me，sir．This is a non-smoking train．
一Oh，sorry．I____ know that．
| A．haven’t known | B．hadn’t know |
| C．didn’t know | D．don’t know |
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一Excuse me，sir．This is a non-smoking train．
一Oh，sorry．I____ know that．
| A．haven’t known | B．hadn’t know |
| C．didn’t know | D．don’t know |
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