Several weeks had gone by____I realized the painting was missing. A.as B.before C....

Several weeks had gone by____I realized the painting was missing. A.as B.before C.since D.when

B


试题分析:考察连词辨析。As随着…;before在…之前;since自从….;when当…时;句意:在我意识到这幅画丢失之前,已经过去了好几个星期。连词before表示在…之前,在不同的语境下有多种不同的翻译。故B正确。
点评:连词的词义辨析要放在上下文的语境中进行,要注意上下文的语义的串联以及逻辑关系的推理,特别要注意一些连词和时间状语的固定搭配。
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