— Why didn't you go to the cinema with us this afternoon? 

— I _____ at the station for my uncle from Beijing. [ ]

A. was waiting

B. have waited

C. am waiting

D. will wait

设有分歧道岔的线路所，当分歧道岔为18号及以上道岔时，列车经过分歧道岔侧向运行，色灯信号机应显示（）。

A、一个绿色灯光

B、一个黄色灯光

C、两个黄色灯光

D、一个黄色闪光和一个黄色灯光