Our monitor who by then admission to Fudan University decided to do some part-time jobs

问题补充：

Our monitor, who by then admission to Fudan 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

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