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
考查时态。句意：蚂蚁有两个胃——一个给自己，一个为别人。——真的吗？相当有趣儿。关于这个事我一点都不知道。结合语境可知描述的是过去的状态，故用过去时态，选D。