第2题: [单项选择]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 参考答案:A 答案解析:[精解] 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