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玉江style
"多久一次"用“how often”，举几个例句供你参考吧！!你多久去游泳一次? How often do you go swimming?你们多久见一次面？ How often do you meet?世界杯多久举行一次？How often is the Cup held?车子多久一班公车？How often does the bus run?你隔多久就在外面吃一次饭？How often do you eat out?
cn是一颗溏心蛋
How often ...?表频率 比如说: -How often do you excise?你多久锻炼一次 -Once a week.一周一次
素手宛花
多久一次是how often，多长时间是 How long。
rosebonbon
How long is it one time?
步步惊心生活
这个应该是问频率的吧那就应该是howoften？举个例子，你多久做一次运动howoftendoyouexercise?That'sall~:))
抬头走我路
How often to do sth
liuwenwenlesley
Howoftendoyouread?如果是陈述句的话，比如你说，一周三次之类的如果你问的是用于提问的“多久一次”，那就是howoften例如
姐的烂手机
how long for once?
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