单项选择题

All flights ______because of the snowstorm, we decided to take the train instead.

A．were canceled
B．had been canceled
C．having canceled
D．having been canceled
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The oil must be used up,______ the light went out.
A．since
B．as
C．because
D．for
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We are firmly______ to the practice of power politics.
A．objected
B．opposed
C．opposing
D．conflicting
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