I don't think you should take the first job offer you get.麻烦

I don't think是主干句（主句）,主（I）谓（dont' think）结构,后面有一个宾语从句,即 you should take the first job offer you get,从句的结构是 主(you)谓(should take) 宾语the job offer,first是定语修饰job offer
宾语从句中又带一个定语从句,you get,修饰先行词the job offer
句意：我认为你不应该答应你得到的第一个录取通知函.