选择A.首先开灯,应该是turn on the light,当light用it指代时,只能是turn it on而不能是turn on it,所以只有A或者D是可能的,然后主句中的the exact moment是时刻,表时间,所以只能用when或者that（除了一些特殊情况,从...
Because of the great speed of light,we see a lamp light up a
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