They have arrived at lunchtime but their flight was delayed．( )A．willB．canC．mustD．should 题目和参考答案——青夏教育精英家教网——

题目内容

14．They have arrived at lunchtime but their flight was delayed．（　　）

A．

will

B．

can

C．

must

D．

should

分析句意：他们本应该午饭时到达的，但他们的航班推迟了．

解答答案：D．根据but后"their flight was delayed"可知是过去时态，故排除A；can have done表示对过去或已经发生的事情的推测，通常用于否定和疑问句中，故排除B；must have done表示过去一定做过某事，对过去情况的推测，不符合题意；should have done表示本应该做某事而没有做．根据"but their flight was delayed"这样的结果可以推断出他们本应该到达却没有到达，故选D．

点评本题考察情态动词的用法．要理解句意，掌握好各个情态动词的用法．充分利用语境，注意分清各个情态动词适用的句型，得出答案．

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