患者，男性，52岁。间歇性无痛性全程肉眼血尿半年，尿脱落细胞检查，可见恶性肿瘤细胞。首选的检查手段为

A．B型超声

B．逆行性输尿管造影

C．IVP

D．KUB

E．CT

Do tell me the ways you think of _____ the problem as   soon as possible.    [ ]

A. to solve                      

B. solving    

C. solve                        

D. being solved