Ling Feng won the first prize in the national English competition and I’m glad that her ef

问题补充：

Ling Feng won the first prize in the national English competition and I’m glad that her efforts at last .

A. worked out

B. got back

C. paid off

D. turned out

答案：

A. worked out

B. got back

(答案→)C. paid off

D. turned out

解析：pay off：偿还，偿清，回报，努力付出终有回报，故选C。