once/twice/three times a
人气：357 ℃ 时间：2019-11-04 12:47:17
解答
是频率,事情在一段时间裏面发生的次数.被提问的话,是how often.
once a week 一周一次
twice a week 一周两次
three times a week 一周三次
many times a week 一周多次
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