单选题 For ten years the problem about the water has not been solved; we came to think that it has been a______problem in this are

【正确答案】 A

【答案解析】[解析] 本句说十年来关于水的问题一直未被解决，我们开始想这已是本地区一个永久性的问题。四个选项中perpetual“永久的”符合句意，而persuasive“善说服的”；picturesque“别致的”；possessive“所有的，物主的”都不正确。因此正确答案为A。