题目内容
（请给出正确答案）
[主观题]
Investigators agreed that passengers on the airliner __________ at the very moment of the
crash.
A. ought to die
B. must have died
C. must be dying
D. should have died
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属于D类火灾的是（）。
A.木材火灾
B.镁铝火灾
C.石蜡火灾
D.甲烷火灾
