题目

Zhang Lin was addicted to computer games during his last year in high school , otherwise he         ____________a student of Beijing University . A．would have been      B．should be     C．has been    D．had been 答案：A 解析: otherwise引起虚拟语气的虚拟语气属于含蓄型的，由句意可以得知是与过去的事实相反，主句用 would have done。下列物质中不能发生银镜反应的是（　　）