问题：
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
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 |
参考答案：