Art has always been _____ of raising consciousness and sending a AansBa meansCa meanDsome mean选择Aa means,a means是宾语,意思是一种方式ans此时是可数名词,意思是方式、方法、途径。以下是百度翻译的解读。means[C] ~ (of doing sth/of sth)C] ~ (of doing sth/of sth)方式;方法;途径an action, an object or a system by which a result is achieved; a way of achieving or doing sthTelevision is an effective means of 电视是一种有效的通信手段。Is there any means of contacting him?有没有什么办法和他取得联系?Have you any means of identification ?你有没有任何身份证件?We needed to get to London but we had no means of 我们需要赶往伦敦,但却没有任何交通工具。 Art has always been中has的应用,就说明后面要接可数单数名词或不可数名词,means正好属于可数单数名词,所以用a means非常适当。