您要查找的是不是：
- How often (ie At what intervals) do the buses run? 公共汽车隔多长时间一班?
- How often do you have a bad back? 你多长时间腰痛一次?
- How often do you hear from your sister? 你多长时间接到你姐姐一次信?
- How often should I take this pill? 这药片一天吃几次?
- How often do you have your car greased? 你多久才给小轿车上一次油？
- How often do you go to the library? 你多长时间去图书馆一次？
- How often do you hear from your brother? 你多久接到你兄弟一次信？
- How often do you wash your hair? 你多长时间洗一次头？
- How often do I have to take this medicine ? 多久吃一次药?
- How often do you have the flights to Bonn? 去波恩的飞机几天一趟?
- How often does No. 19 run at this time of day? 现在这时候19路车每隔多久经过这里?
- How often does this bus run at this time of day? 现在这个钟点隔多长时间来一班车?
- How often do you hear from you sister? 你多长时间收到你姐姐一封信?
- How often have you been told to confine your curls? 不是要你经常梳理你的卷发吗?
- How often do you shampoo your hair? 你多久用洗发剂洗一次头?
- Q. How often does an NEA make a close approach? 一个NEA多久非常靠近一次?
- How often do you visit your grandparents? 你多久看望爷爷奶奶一次?
- How often is the train to Mt. Emei? 去峨眉山的火车多长时间一班?
- How often do you go to the dentist? 你多久看一次牙医?
- How often am I supposed to drink? 我该隔多久喝一次？
