【单选题】

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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根据网考网移动考试中心的统计，该试题：

88%的考友选择了A选项

1%的考友选择了B选项

1%的考友选择了C选项

10%的考友选择了D选项

Because of the great speed of light, we see a lamp light up almost at the exact moment ______.A．we turn it on