问题
选择题
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
答案：B
题目分析：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。