The young man who by then admission to university decided to do some part-time jobs to g

问题补充：

The young man，who by then admission to university，decided to do some part-time jobs to gain more practical experience．

A. gained

B. was gaining

C. has gained

D. had gained

答案：

A. gained

B. was gaining

C. has gained

(答案→)D. had gained

解析：考查时态：句意：到那时已经获得大学录取通知书的年轻人，决定做兼职工作来获得更多的实用的经验。从句中的by then和decided to do可以判断空格处的动作发生在decided to do之前故此处用过去完成时。答案选D项。