题目内容
They _________ have arrived at lunchtime but their flight was delayed.
A. will B. can
C. must D. should
D
【解析】
试题分析:句意:他们本应该午餐时到达,但是被航班耽误了。本题考查虚拟语气故A、B项排除,must have done意为过去肯定做了某事;should have done意为过去应该做某事而实际没做,故选D。
考点:考查虚拟语气。
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