. His hard work paid when he got the result.A. offB. overC. outD. back

问题补充：

. His hard work paid when he got the result.

A. off

B. over

C. out

D. back

答案：

(答案→)A. off

B. over

C. out

D. back

解析：考查短语：pay off 还清，得到回报，句意：当他得到结果的时候他的努力工作得到了回报。所以选A。