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

這題考查連詞的用法，Since自從，While雖然，當(dāng)…時候，Because 因為， As因為，當(dāng)..時候，根據(jù)句意：雖然廣告很有用，我想我們不該完全依賴它們。選B。
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