该文中共有十处错误,每句中最多有两处,错误涉及一个单词的增加、

该文中共有十处错误,每句中最多有两处,错误涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号(∧),并在此符号下面写出该加的词。
删除：把多余的词用斜线（＼）划掉。
修改：在错的词下划一横线,并在该词下面写出修改后的词。
注意：1、每处错误及其修改均仅限一词；
         2、只允许修改十处,多者(从第11处起)不计分。

Ten years ago, I had worked as a night guard in a factory. On a rainy night, all the lights of factory went out all of a sudden. I rushed out and could see nothing. Lucky for me, the warning system was directly connected with the police station. Three or four minutes late, four police car arrived at the front gate. He searched the factory carefully, tried to find something unusual. In the end, I am told that the rain had brought about the short circuit, that caused the accident.       

71去掉had  72在第二个factory前加the 73 and改为but  74lucky改为luckily  75late改为later 76 car改为cars  77He改为They 78try改为trying 79am改为was 80that改为which81