—You were out when I dropped by your house.

—Oh, I ______ for a friend from England at the airport. [ ]

A. was waiting

B. had waited

C. am waiting

D. have waited

下列诊断颅底骨折的依据中最确切的是（）

A.皮下溢血斑

B.脑脊液漏

C.意识障碍

D.耳道或鼻腔出血

E.X线检查可以颅底骨折