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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单项选择题
Fat cannot change into muscle______ changes into fat.
A．any more than
B．no more than
C．no less than
D．much more than
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
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