◎ 题干
        advertisements are of great help, I don't think we should entirely rely on them. 
  [     ]
A. Since      
B. While          
C. Because        
D. As
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“advertisements are of great help, I don't think we should entirely rely on them. [ ]A. Since B. While C. BecauseD. As…”主要考查了你对  【从属连词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。