The student served as the Secretary of League Branch and the Secretary of CCP(Chinese Communist Party)Branch during his （或者her) undergraduate study period, fulfilling his (或者her) responsibilities of these two duties. and enjoying harmonous relations with both teachers and classmates.
括号内的是帮助你理解的,（Chinese Communist Party) 起解释说明作用,可以保留.其他两个括号你根据性别选好用his或her后去掉括号内容.