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

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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

解析题型：词汇题。turn on开，旋开(电灯、自来水、无线电等)，turn off是其反义词，其中on是副词。“动词+副词”构成的动词短语后跟代词时，该代词必须放在动词和副词之间。which作连接代词时，在其引导的名词性从句中充当某种成分。

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