问题补充：
Jenny works hard as usual and it has . She got the first in the final exam again.
A. showed off
B. paid back
C. paid off
D. turned up
答案：
A. showed off
B. paid back
(答案→)C. paid off
D. turned up
解析：A.炫耀 B.偿还 C.付清，见到成效 D.出现句意：珍妮像往常一样努力学习并且取得了成效，在期末考试她又取得了第一名。故选C
