Question

I have a piano lessons twice a week.对划线部分提问)

________ ________ do you have piano lessons?

Answer

How often

【解析】句意：我一周上两次钢琴课。句中划线的部分是twice a week，一周两次，表示上钢琴课的频率，疑问词应用How often，多久一次。