We travelled together as far as Chicago we said goodbye to each other.A. whichB. whenC.

问题补充：

We travelled together as far as Chicago, we said goodbye to each other.

A. which

B. when

C. why

D. where

答案：

A. which

B. when

C. why

(答案→)D. where

解析：考查定语从句。先行词Chicago为下文逻辑地点状语，故选D。