egg前面用a,还是an?

egg前面用a,还是an? a egg还是an egg look,there is 这里选a egg还是is egg还是an egg?inthe box. 鸡蛋的英语是EGG,那么一个鸡蛋是A EGG还是AN EGG 字母A前面用a还是an a egg和an egg哪个正确? s前面用a还是用an university前面用“a”还是用“an”? year前面用a 还是用an exciting前面介词用a 还是an mp4前面用an 还是a exciting前面用定冠词a还是an engineer 前面用A 还是AN 字母“n”前面用a还是an? ufo前面用a还是an useful前面用an还是a?为什么? 字母u前面用a还是an UFO前面用a an 还是the