The police have finally the mystery (疑案).
A. succeeded to solve
B. succeeded in solving
C. succeeded solving
D. succeeded on solving
网友回答
A. succeeded to solve
(答案→)B. succeeded in solving
C. succeeded solving
D. succeeded on solving
解析： 考查短语：succeed in doing成功做成某事，句意：警察最终成功的解决了这个疑案。故选B。