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

联合国大会通过的《儿童权利公约》确立了儿童的社会权利主体地位，体现这一核心精神的基本原则是（）。

A.儿童利益最佳原则

B.尊重儿童尊严原则

C.尊重儿童观与意见原则

D.无歧视原则

E.保护儿童原则