第29题: [单项选择]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 A. A. perpetualB. persuasiveC. picturesqueD. possessive 参考答案:A 答案解析:perpetual永久的;persuasive善说服的;picturesque独特的;possessive所有的,物主的。