义齿基托蜡型的大小和伸展范围的设计应参照（）

A.患者的年龄

B.患者的性别

C.基牙的健康状况

D.缺牙情况

E.义齿的支持形式

–What did Mr Jones do before he moved here?

-He_______ a city bus for over twenty-five years.

A．has driven

B．drove

C．drives

D．is driving