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  3. Because of the great speed of light, we see a lamp light up almost at the exact moment______.

Because of the great speed of light, we see a lamp light up almost at the exact moment______.

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问题 Because of the great speed of light, we see a lamp light up almost at the exact moment______.
选项 A、we turn it on
B、when we turn on it
C、that we turn on it
D、which we turn it on
答案A
解析 turn on意为“开，旋开(电灯、自来水、无线电等)”，其中on是副词。“动词+副词”构成的动词短语后跟人称代词时，该人称代词必须放在动词和副词之间。例如：Hesuffers a great deal from smoking，so he has made up his mind to give it up．他深受吸烟之苦，因此决心戒烟。which作连接代词时，在其引导的名词性从句中充当某种成分。这样B、C和D均可排除，只有A为正确答案。
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