Liu Xiang trained hard before the Asian Games in Guangzhou and it . He won the gold medal

问题补充：

Liu Xiang trained hard before the Asian Games in Guangzhou, and it . He won the gold medal in 110 meters’ hurdles.

A. worked out

B. paid off

C. marked out

D. got through

答案：

A. worked out

(答案→)B. paid off

C. marked out

D. got through

解析：短语辨析。 A. 解决；B. 付清；取得成功；C. 标示；D.结束；通过。句意：刘翔在广州亚运会前刻苦训练，取得了成功。……故选B。