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because，as和since是从属连词，引导原因状语从句；for是并列连词，连接两个并列的分句，其中第二个分句表示说话人作出判断的理由。because用于回答why引起的疑问句，但as，since和for则不可以。because of为复合介词。
易混词语辨析
【摘 要】
：
because，as和since是从属连词，引导原因状语从句；for是并列连词，连接两个并列的分句，其中第二个分句表示说话人作出判断的理由。because用于回答why引起的疑问句，但as，since和for则
【机 构】
：
江苏
【出 处】
：
中学英语园地(高中版)
【发表日期】
：
2005年4期
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