题目内容
Several weeks had gone by _______ we realized the painting was missing.
A. as B. since
C. before D. when
C
【解析】
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C正确。
考点:考察连词辨析

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