It took more than twenty years for the great artist _the painting was finished completely

问题补充：

It took more than twenty years for the great artist _the painting was finished completely.

A. as

B. before

C. after

D. when

答案：

A. as

(答案→)B. before

C. after

D. when

解析：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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