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

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【题目】Several weeks had gone by______ I realized the painting was missing.

A. as B. before C. since D. when

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【答案】B

【解析】

试题分析：考查连词词义辨析。A. 例如；B. 在...之前；C. 自从；D. 当，在...时候。句意：几个星期过去了，我才意识到这幅画不见了。故选B。