英文中once a week用什么时态啊?

英文中once a week用什么时态啊? once a week用什么时态 once 用什么时态?懂的来.once/twive/ three times.单独出现用什么时态啊、那 once a week 呢 对once a week提问用什么 once a day在句中应用什么时态 at once用于什么时态中 my mum washes the clothes once a week once划线用什么提问 for a week,once a week,in a week,after a week有什么区别 in a week 用于什么时态? 对once a week 提问用? 意思once a week once a week from next week 用什么时态? 英语翻译顺便教教我at once用在什么时态和句子里啊?thanks a lot! 对 once a week never for an hour three times ever对 once a week neverfor an hourthree timesevery daytwo hours提问用什么? often和usually能不能与 once a week 用在一个句子中? he watches tv twice a week 知道twice a week 是固定搭配,那么用once time a week语法上有什么错误吗 once a week和twice a week