Had the US Airways captain not guided his jet to a safe landing on the Hudson River, just west ...
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A 试题分析：句意：要不是那位美国航空公司机长指挥飞机安全降落在纽约州西部的哈德逊河上的话，那么机上100多号人连同地面更多的人也许就命丧黄泉了。上文用了与过去事实相反的虚拟语气，下文就应该是对过去的假设的推测。might have died也许就会死了；needn’t have died本来没有必要去死。