是would have happened.
情态动词过去时 + 完成时表示对过去事情的推测.这里也是一样..表示推测"要不是他kept his head,就会发生一场事故"...例如:
I would have done my homework if I wasn't ill.如果不是我病了,我已经做完作业了...
类似的还有:
must have done/ could have done/should have done等等...详细信息请参见语法书上对表推测情况的说明..
He kept his head otherwise the accident would have happen
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