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
网友回答
A. couldn’t be prevented
B. mustn’t have prevented
(答案→)C. wouldn’t have been prevented
D. shouldn’t prevent
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。