题目内容

They        have arrived at lunchtime, but their flight was delayed.
A．willB．canC．mustD．should
D
考查虚拟语气。根据后一句their flight was delayed.可知这是对过去情况进行假设。Must have done一定做了某事（表示推测）；should have done本应该做某事实际上却没有做。句意：他们本应该在午饭到，但是他们的航班延误了！
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