Her family__________much larger than mine four years ago.Her family__________dancing and singing when I came in last night.

A．were; was

B．was; were

C．was; was

D．were; were

学习行政管理学有关知识，明白了行政能率、行政效率、行政效益、行政效能四个概念。为了实施有效的城市规划管理，必须追求( )方面的行政管理目标。

A．行政效力
B．行政效率
C．行政效益
D．行政效能