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It took more than twenty years for the great artist       _the painting was finished completely.
A.asB.beforeC.afterD.when
B

试题分析:句意:在这幅绘画完全完成之前,花费了这位伟大的艺术家20多年的时间。As作为; before在……之前 ;after在……之后 ;when当……时候,选B。
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