once a day.和once a day.every day.哪句话对once a day.和once a day.every day.哪句话对?为什么?

once a day Once Upon a day once a day.和once a day.every day.哪句话对once a day.和once a day.every day.哪句话对?为什么? once a Once a day ,me and you ,meet.. once a month 和 a month once 意思一样吗? once a day=one time a day? She drink milk once a day 对 once a day 提问 We should clean the rabbit's hutch once a day.（对once a day提问） I feed my rabbit carrots once a day对划线部分提问once a day划线 I walk them in the park once a day.对once a day提问 David__does sports.Heonly swims once a day.A.often B.always C.seldom D.never Give this plant a lof of water once a day d的否定句是什么? once a week和twice a week 是once every morning 还是once a day every morning.为什么? once a year啊,once是什么词性, water once day i it a连词成句? I water it once a day.的问句