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
______ bright was the moon that the flowers were bright as by day.
A. So
B. Such
C. Such a
D. Much
单项选择题
Nancy was surprised that they have ______ . They seemed to be a happy couple.
A. split up
B. broken down
C. fallen through
D. knocked out
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