He kept his head; otherwise the accident ______.

He kept his head; otherwise the accident ______.
A、would happen
B、happened
C、would have happened
D、happens
【正确答案】:C
【题目解析】:这是虚拟语气,would have done是过去本应该做而没做的(从kept可以看出这是对过去虚拟)