more subtle, much subtle, subtler; hard, harder, hardly One of the greatest creativity killers is __________ and so deeply rooted in our culture that it is __________ noticed.
more subtle, much subtle, subtler; hard, harder, hardly One of the greatest creativity killers is __________ and so deeply rooted in our culture that it is __________ noticed. 【正确答案】：more subtle，hardly 【题目解析】：第一个空用subtle的比较级，根据前后文之间的意义，第二个空是否定的副词
