单选题 Not until the 1980s ______ in Beijing start to find ways to preserve historic buildings from destruction.无

【正确答案】 A

【答案解析】句意：直到20世纪80年代，北京一些相关人士才开始探索保护历史建筑的方法。concerned指“involved in something or affected by it”。 relative指“connected with a particular subject”。