It took more than twenty years for the great artist       _the painting was finished completely.
A．a(chǎn)sB．beforeC．a(chǎn)fterD．when
B

試題分析：句意：在這幅繪畫完全完成之前，花費(fèi)了這位偉大的藝術(shù)家20多年的時(shí)間。As作為； before在……之前 ；after在……之后 ；when當(dāng)……時(shí)候，選B。
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