单选题There was a traffic 

问题补充：

单选题Therewasatrafficjam;otherwiseI____hereontime.A.would beB.had been C.should beD.would have been

答案：

D解析考查虚拟语气。这是一个含蓄条件句otherwise=If there had not been a traffic jam.因为前面是一个过去时，所以这里是表示和过去相反的虚拟语气，主句里面用情态动词+have done.