How often do you watch TV?.A.Half an hour. B.Three hours. C.Hardly ever

问题补充：

--- How often do you watch TV?

--- .

A.Half an hour. B.Three hours. C.Hardly ever

答案：

解析：Half an hour.半个小时；Three hours.三个小时；Hardly ever几乎从来不。根据上文，你多久看一次电视？可知上文提问频率，故选C。