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---_______ the plane have taken off on time?
--- I’m afraid not. The fog was too thick then.
A.WouldB.ShouldC.CanD.Must
C

试题分析: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。 
点评:情态动词有具体的词义,但也同助动词一样,需要与其他词语一起构成句子的谓语,另外情态动词没有人称和数的变化,情态动词后必须跟动词原形。
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