题干
It is the customers’ needs that has made chain stores so popular in big cities in China.
A：meeting
B：met
C：to have met
D：being met
答案(点此获取答案解析）
A
A：meeting
B：met
C：to have met
D：being met
轴上的圆 
过点 
和 
，圆 
的方程为 
．