New Orleans police and prosecutors should have known they had the wrong guy back in 1979.
问题描述：
New Orleans police and prosecutors should have known they had the wrong guy back in 1979.
主要是“had the wrong guy back in 1979”这个部分看不懂了,
请帮忙分析一下这个部分的句子成分
答
New Orleans police and prosecutors 新奥尔良警察和检察官 做主语
should have known 本应该知道 做谓语
they had the wrong guy 他们抓错了人 宾语从句
back in 1979 追溯回1979年 状语