________ advertisements are of great help, I don’t think we should entirely rely on them.
A．BecauseB．SinceC．OnceD．While
D

試題分析：考查連詞：A. Because因為  B. Since自從，既然， C. Once 一旦D. While雖然，然而，當(dāng)…時候，句意：雖然廣告對我們很有幫助，但我想我們不該完全依賴它們。while表示雖然，有轉(zhuǎn)折的意思。選D。
點評：連詞主要看上下文的邏輯關(guān)系，短語的辨析沒有捷徑可走，只能在平時的學(xué)習(xí)中加強記憶。While的含義比較多，是高考�？键c。
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