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
Although he thought he was helping us to prepare the dinner, he was actually______ the way.
A．in
B．off
C．by
D．on
单项选择题
Because of the great speed of light, we see a lamp light up almost at the exact moment______.
A．we turn it on
B．when we turn on it
C．that we turn on it
D．which we turn it on
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