问题
选择题
—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
答案
答案：D
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。