—I’m sorry,but there’s no smoking on this flight.?
—Oh,I _______ that.Sorry, I won’t again.
A．don’t knowB．didn’t know?
C．won’t knowD．haven’t known?
B?
本題考查動詞時態(tài)。根據(jù)句意“在(說話)之前不知道飛機(jī)上不能抽煙” 可知，這是對過去事實的敘述，所以用一般過去時。
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