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_________ advertisements are of great help, I don’t think we should entirely rely on them.

A.SinceB.WhileC.BecauseD.As

B

解析试题分析:考查连词:A. Since自从,既然     B. While 虽然,当.. 时候,然而Because因为      D. As因为,当…时候,句意:虽然广告很有用,但我认为不能完全依赖它们。选B。
考点:考查连词辨析。
点评:此题主要考查连词的辨析,选择连词主要是看前后句的关系,因果关系用表因果的连词,转折关系用转折连词,并列关系用并列连词,要求考生具有一定的句子分析能力和词义辨析能力。

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