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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______from a distance, the island looked like a cloud.
A. Viewing
B. To view
C. Viewed
D. Being viewed
单项选择题
We met the young couple at a party three weeks ago. ______we've had no further communication.
A. Thereof
B. Thereby
C. Thereafter
D. Thereabouts
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