once a year啊,once是什么词性,

once a year啊,once是什么词性, Once a year的答案是什么 用once a year造句 once half year,twice a year They go to the park once a year (用once a year 提问) once a year in Japan和in Japan once a year有什么区别么? They move their homes once a year.划线提问,划once a year.对不起,刚开号, once a the family goes shopping once a week.once是什么词性, once! once once Once once Once once once once