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。