I was wondering what to do with my car which won't start ________ a kind man offered to help.

A．while

B．and

C．so

D．when

当肿块占据肾上腺及肾上极区，下列哪项是判断肾上腺肿瘤的依据（）

A、肿瘤大部分位于肾轮廓内 

B、肾皮髓质交界消失 

C、肾皮髓质交界清晰 

D、肾窦旁脂肪移位或消失 

E、肿瘤小部分位于肾轮廓内