题目内容

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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