His three years of hard work — he did a good job in the NMET and was admitted into a

问题补充：

His three years of hard work — he did a good job in the NMET and was admitted into a key university.

A. turned out

B. ran out

C. paid back

D. paid off

答案：

A. turned out

B. ran out

C. paid back

(答案→)D. paid off

解析：考查词组意思，turned out意思“出席”，ran out意思“用完”， paid back意思“偿还”，paid off意思“取得成功”，句子意思“进过三年的刻苦学习，终于在全国普通高校入学考试并被一所重点大学录取的了成功”，所以选D