______the city's public school system should be open to the children of migrant workers has become the focus of discussion.答案选whether..我选了that,为什么不可以?答:that引导的名词性从句,是一个陈述句变过来的,表示一个事实,可以改为:the fact that -同位语从句。whether 引导的名词性从句是由一个一般疑问句变过来的,表示一个一般疑问(是不是,是否),可以改为The question whether-同们语从句。从句意可知选whether最佳。译:城市的公立学校(系统)是否应该向农...