单项选择题

The oil must be used up, __ the light went out.

A．since
B．as
C．because
D．for
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单项选择题
Professor James used student volunteers as ______ for his experiment.
A．models
B．cases
C．agents
D．subjects
单项选择题
A terrible traffic accident happened; people were saddened when they watched the ______ victims.
A．panic
B．patriotic
C．pathetic
D．periodic
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