----I’m sorry, but making a telephone call is not allowed in the meeting-room.
----Oh, I that, Sorry, I don’t do that again.
A. don’t know
B. didn’t know
C. won’t know
D. haven’t known
网友回答
A. don’t know
(答案→)B. didn’t know
C. won’t know
D. haven’t known
解析：根据语境, “我不知道”, 应该指说话前的动作, 而现在已知道了。所以本题用一般过去时。