单项选择题

Many types of rock are __ from volcanoes as solid, fragmentary material.

A．ejected
B．injected
C．propelled
D．flung
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单项选择题
He was looking admiringly at the photograph published by Collins in_____ with the Imperial Museum.
A．combination
B．collaboration
C．connection
D．collection
单项选择题
Investigators agreed that passengers on the airliner______ at the very moment of the crash.
A．should have died
B．must be dying
C．must have died
D．ought to die
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