The passenger ______(肯定出事了), otherwise he would have arrived by that time.must h

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问题 The passenger ______(肯定出事了), otherwise he would have arrived by that time.

选项

答案 must have had an accident

解析 must后接动词原形表示对现在发生的事情的肯定猜测，接完成时表示对过去事情的肯定猜测。

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[originaltext]Ensuringthesafetyofpassengersandaircraftisamajorcon