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

发布时间：2020-08-17 04:16:20

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

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A. as
(答案→)B. before
C. since
D. when
解析：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。
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