问题
选择题
I would have come earlier, but I ________ that you were waiting for me.
A．didn’t know
B．hadn’t know
C．would have known
D．haven’t known
答案
A
因为would come earlier是与过去事实相反的虚拟语气，而后面分句表示的是事实：当时我的确不知道…所以用一般过去时，选A。