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20.---________the plane have taken off on time?
---I'm afraid not.So many flights were delayed due to the bitterly cold weather.(  )
A.NeedB.ShouldC.CanD.Must

分析 -飞机能按时起飞吗?
-恐怕不行.因为天气异常寒冷,许多航班都延误了.

解答 答案:C
题干中用了一般疑问句,表示不肯定的语气;can have done表示对过去事实的不肯定推测或怀疑;need需要,should应该,must一定.句意表达的是不肯定推测,故选C.

点评 情态动词的用法是英语中常考的语言点.通常考查的方式有虚拟和推测,本题考查的是情态动词的推测用法.学习时要注意积累.

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