your first job right after college probably will not be your job thirty years ------a.since then b.after that

问题描述:

your first job right after college probably will not be your job thirty years ------
a.since then b.after that

since then 从那时起 after that 在那以后
你毕业以后的第一份工作不一定是你三十年后的工作. 可换成later.