对以下句型分析
问题描述：
对以下句型分析
When reports came into London that a wild puma had been spotted,they are not taken seriously.
在这一句里that a wild puma had been spotted是定语从句还是状语从句
如是定语从句,先行词是reports,在从句中作什么角色?
如是状语从句,是哪一种状语从句?
答
既不是状语从句也不是定语从句,这是同位语从句