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

某六层住宅楼雨水管道及配件安装工程检验批质量验收，施工单位视以下情况，请给出相应的检查评定结论意见。