胰高血糖素瘤的定位诊断中阳性率最高的是（）。

A.B超

B.CT

C.MRI

D.腹腔动脉造影

E.经皮肝穿刺插管选择性门静脉造影

—When will you come to Daqing?

—I will call you ________ I arrive. [ ]

A. till

B. while

C. as quickly as

D. as soon as