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He has already cast his vote for the President．他已投了总统的票。
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cast的过去式和过去分词都是cast。
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213 cause—reason
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cause可以作名词和动词。作名词时，表示“原因”、“起因”：
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The cause of the fire was a cigarette-end．火灾的起因是一个烟头。
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What was the cause of this all？这一切起因何在？
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No one could guess the cause．没人能猜出原因。
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偶尔也可译作“理由”：
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You have no cause for complaint．你没有抱怨的理由。
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cause还可用作动词，表示“引起”、“造成”：
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Does smoking cause cancer？吸烟能引起癌症吗？
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He declined, fearing to cause her inconvenience．他婉言谢绝，怕给她造成不便。
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His action caused much excitement．他的行为造成很大轰动。
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有时跟一复合宾语，表示“使……”：
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What caused him to change his mind？什么使他改变了主意？
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Heating a copper bar will cause it to expand．对铜棒加热会使它膨胀。
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reason主要表示“理由”：
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You have no reason to disbelieve him．你没有理由不相信他。
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She had every reason for thinking so．她有一切理由这样想。
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He refused to disclose the reason why he did it．他不肯透露他这样做的理由。
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但有时也可以表示“原因”：
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He is retiring for reasons of health．由于健康的原因他将退休。
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The reason for my lateness is that I missed my bus．我迟到的原因是我误了车。
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For some reason he was neither surprised nor frightened．由于某种原因他既不吃惊也不害怕。
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