单项选择题

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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单项选择题
Justice, as well as the law, ______that these bandits ______severely punished.
A．demand... be
B．demands... be
C．demand... are
D．demands... are
单项选择题
The United States Constitution provides for a count of the population ______a census, every ten years.
A．called
B．which called
C．that it is called
D．as called
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