It takes a long time to go there by train中time不可数为什么前面还能加a?
问题描述：
It takes a long time to go there by train中time不可数为什么前面还能加a?
答
a long time 强调的是一段时间,如 an hour,two weeks ,five years等等,hour ,week 和year 都是可数名词,所以用a long time.