Investigators agreed that passengers on the airliner______ at the very moment of the crash.

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问题 Investigators agreed that passengers on the airliner______ at the very moment of the crash.

选项 A、should have died
B、must be dying
C、must have died
D、ought to die

答案C

解析 must have done用来表示对过去某动作的肯定推测,作“肯定,一定是”讲,例如:He must have been to England for he knows so much about that country.他一定去过英国,因为他了解那么多有关那个国家的事情。He must have forgotten to wind the clock last night.他昨晚准是忘记给表上弦了。
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