单项选择题

Anna was reading a piece of science fiction, completely ______ to the outside world.

A．having been lost
B．to be lost
C．losing
D．lost
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单项选择题
He will surely finish the job on time ______ he s left to do it in his own way.
A．in that
B．so long as
C．in case
D．for fear that
单项选择题
Investigators agreed that passengers 0n 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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