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单选题

Investigators agreed that passengers on the airliner ____ at the very moment of the crash.(2002.6.CET-4)

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

单选题

He left orders that nothing ____ touched until the police arrived here.(1997. TEM-4)

A. should be
B. ought to be
C. must be
D. would be

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