Several weeks had gone by____I realized the painting was missing. 
A．a(chǎn)s B．before C．since D．when
B

試題分析：考察連詞辨析。As隨著…；before在…之前；since自從….；when當(dāng)…時(shí)；句意：在我意識(shí)到這幅畫丟失之前，已經(jīng)過去了好幾個(gè)星期。連詞before表示在…之前，在不同的語(yǔ)境下有多種不同的翻譯。故B正確。
點(diǎn)評(píng)：連詞的詞義辨析要放在上下文的語(yǔ)境中進(jìn)行，要注意上下文的語(yǔ)義的串聯(lián)以及邏輯關(guān)系的推理，特別要注意一些連詞和時(shí)間狀語(yǔ)的固定搭配。
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