—Could you let me know _______ yesterday?

—Because the traffic was heavy.[ ]

A. why you come late

B. why you came late

C. why did you come late

D. why do come late

下列何种检查方法对肾癌诊断具有决定意义（）

A.腹部平片

B.立位透视

C.选择性肾动脉造影

D.逆行肾盂造影

E.IVP