As computer security systems become even more advanced, ______ the methods of those who try to break into them illegally.
 
【正确答案】 A
【答案解析】 语法知识。本句为主从复合句,空格处的句子为主句,选项C与选项D缺少谓语动词,可排除。选项B是错误的结构。选项A是so引导的部分倒装结构,助动词do替代前面从句的谓语结构。故答案为A。