for是一个等立连词,连接的是两个并列分句.该句是两个因果关系的分句.because 用以表示已知或未知的事实,语气最强,引导的从句通常置于主句之后,只有在强调时才置于主句之前.as 的语气较弱,较口语化,所表的原因较明显,或是已知的事实,无需强调,引导的从句之前不可用强调词和否定词not ,也不可用强调结构.when引导时间状语从句,此句为原因状语从句.该句原因很明显,无需强调,所以不用because而选as.
___there is no air or water ,there can be no life of any kin
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