--- the plane have taken off on time?
--- I’m afraid not. The fog was too thick then.
A. Would
B. Should
C. Can
D. Must
网友回答
A. Would
B. Should
(答案→)C. Can
D. Must
解析:这是一组对话。上文,飞机能按时起飞吗?下文,我恐怕不能,雾太大了。would表示说话人的意愿或向对方提出请求,语气比will婉转,仍指现在时间;should 意为“应该” ,可表示劝告、建议、义务、责任等。表示推测,意为“可能”, 常用于否定句和疑问句中;must 表示主观看法,意为“必须、一定”,根据题意,故选C。