she was 后面的表语就是疑问词Where
主语:Where she was at the time of the murder
系词:was
介短作表语:of major concern to the police
句意:凶杀案发生时她在什么地方是警察的主要关注点.副词居然做表语？副词居然做表语？怎么没有呢? 这是疑问副词哟! 如: Where were you just now?