Why didn't you catch the bus ____ I told you用when还是as 用法?我知道有as I told you to.有什么不一样么？

Why didn't you catch the bus ____ I told you用when还是as 用法?我知道有as I told you to.有什么不一样么？
Why didn't you catch the bus ____ I told you
用when还是as 用法?
我知道有as I told you to.
有什么不一样么？

Why didn't you catch the bus ____ I told you用when还是as 用法?我知道有as I told you to.有什么不一样么？
as,
指的是“正如,就像我告诉你一样”
as sb told you as someone said
是比较常用的写法
这里when表示在...时候,明显不对.

这里用as。根据意思“你为什么不坐我告诉你的那辆公交车？”as是“正如...”的意思，与此处很契合；而when是“当...时候”，明显不符合语义。