Dina,____  for months to find a job as a waitress, finally took a position at a local advertising agency.    [ ]

A. struggling          

B. struggled    

C. having struggled    

D. to struggle

男性，60岁，间断性排尿中断5天，腹平片提示膀胱区有直径2.5cm椭圆形阴影，追问病史，有尿频伴排尿困难4年，该患者最可靠的诊断方法是（）

A.IVP

B.立位腹平片

C.侧位腹平片

D.膀胱镜

E.CT