—An ant has two stomachs—one for itself, one for others.
—Really? Quite interesting. I anything about it.
A. don't know
B. have known
C. haven't known
D. didn't know
网友回答
A. don't know
B. have known
C. haven't known
(答案→)D. didn't know
解析：根据语境可知第二个人在说话前不知道第一个人谈及的事情，用一般过去时。