问题
选择题
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
C
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。
