Why didn't you go to the cinema with us this afternoon?I__at the station for my uncle fyom Being.

问题描述:

Why didn't you go to the cinema with us this afternoon?I__at the station for my uncle fyom Being.
A.was waiting B.necessary C.am waiting D.will wait

A
问的是过去为什么不一起去,用过去进行时,说明当时正在进行的动作.