题目内容
They________have arrived at lunchtime but their flight was delayed.(2011·全国 )
A.will B.can C.must D.should
D
【解析】D [考查虚拟语气的用法。句意为:他们本该午饭时到达,但他们的航班推迟了。should have done本来应该做某事,而实际没做。but their flight was delayed这样的结果,说明他们本来该到达却没有到达,因此选D。]
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