单选题
Once a political system has been corrupted right from the very top leaders to the lowest ranks of the government, the problem is very complicated.
【正确答案】
A
【答案解析】该句意为：一旦一个国家政府的政治系统中从上到下都腐败的话，那么问题就相当复杂了。corrupted：腐败的；rotten：腐烂的，腐败的；disintegrated：分解的；boiled：煮沸的；spoiled：宠坏了的。