The traffic accident wouldn’t have happened yesterday, but the driver ______ really careless.
A. was B.is C. were D. had been
知识点：一般过去时及其被动式
A
试题分析：考查时态。由题干句可知,这里谈论的是过去（yesterday）发生的事情,所以应用一般过去时。这道题是真实和虚拟混用的范例。故选A。
