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

混凝泵主要用于（）等场所。

A.固定点长时间作业；

B.小型工地；

C.用料点集中；

D.泵送距离及高度较大。