_________ advertisements are of great help, I don’t think we should entirely rely on them.
A．SinceB．WhileC．BecauseD．As
B

試題分析：考查連詞：A. Since自從，既然     B. While 雖然，當.. 時候，然而Because因為      D. As因為，當…時候，句意：雖然廣告很有用，但我認為不能完全依賴它們。選B。
點評：此題主要考查連詞的辨析，選擇連詞主要是看前后句的關(guān)系，因果關(guān)系用表因果的連詞，轉(zhuǎn)折關(guān)系用轉(zhuǎn)折連詞，并列關(guān)系用并列連詞，要求考生具有一定的句子分析能力和詞義辨析能力。
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