You must go ____I told you.选after还是as

as,

用after 需要变成 after I tell you. after my telling you.

as

as 意思是你必须按照我说的做~

AS
有疑问再问我。

as

as。首先这句话是一个方式状语从句，而引导方式状语从句就会用as,表示“正如、正像”。整个一句话的意思就是“你必须按照我说的走。”
而after做连词时只能引导时间状语从句，表示在……之后