单选题I would have come ea

问题补充：

单选题Iwouldhavecomeearlier,butI________thatyouwerewaitingforme.A.hadn’t knownB.didn’t knowC.would have knownD.haven’t know

答案：

B解析本题考查时态。题中有隐含虚拟语气。If I had known that you were waiting for me, I would have come earlier.可以知道是对过去事实相反的虚拟语气，故用一般过去时态。选B。