---I’m sorry, but there is no smoking on this flight.
---Oh, I _____that. Sorry, I won’t again.
A．don’t knowB．didn’t knowC．won’t knowD．haven’t known
B

試題分析：考察時(shí)態(tài)。句義：—對(duì)不起。在飛機(jī)上不能抽煙。—哦！我之前不知道這點(diǎn)。我以后不會(huì)再這樣做了。根據(jù)句義可以在說(shuō)話之前不知道在這里禁止抽煙。故使用一般過(guò)去時(shí)。B正確。
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