They kept trying, and their efforts finally .A. make itB. paid offC. are made itD. are pai

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A. make it
(答案→)B. paid off
C. are made it
D. are paid off
解析：make it意为“做成功、到达”，无被动式，排除选项C。选项A时态错。pay off意为“（计划等）顺利成功”时，也是没有被动式的。故正确答案为B。