The pilot kept calm in the terrible storm, otherwise the accident ________.

The pilot kept calm in the terrible storm, otherwise the accident ________.

A.couldn't be prevented

B.mustn't have prevented

C.wouldn't have been prevented

D.shouldn't prevent

答案及解析： C

解析：

根据句意“幸亏飞行员保持镇静，要不然这场事故是不会避免的”，对过去的推测．