―I'msorry，butsmokingisnotallowedinthissectiononthetrain...

問題詳情：

―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

【回答】

知識點：一般過去時及其被動式

題型：選擇題