2. 外语
  3. Investigators agreed that passengers on the airliner must (die) ______ at the very moment of the crash.

Investigators agreed that passengers on the airliner must (die) ______ at the very moment of the crash.

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问题 Investigators agreed that passengers on the airliner must (die) ______ at the very moment of the crash.
选项
答案have died
解析 本题考查情态动词。句意：调查人员一致认为机上乘客在飞机坠毁那一刻就都全部遇难。must经常表示一种肯定推测，表示对现在或将来的肯定推测；表示对过去的肯定推测，用must have done形式。本题很明显是对过去情况的推测。
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