It was ______ by the railway board that the cost of rail fares would be increased by ten percent.
 
【正确答案】 D
【答案解析】 动词词义辨析。notice“注意到”;state“说明,阐明”;propose“提议,建议”,一般用虚拟语气;inform“通知,告知”。根据句意,只有inform符合要求。故答案为D。