I have been teaching for over twenty years, but never _____ a girl as bright as Lily.

A．I have met

B．I had met

C．have I met

D．had I met

 女，56岁，突感眩晕呕吐，言语不清。查：声音嘶哑，吞咽困难，左眼裂，瞳孔变小，左面部和右半身痛觉减退，左侧指鼻试验不准。

为了明确诊断，最有意义的检查为()

A．颅脑CT

B．颈动脉多普勒检查

C．颅脑X线平片

D．脑血管造影

E．腰穿