— does he have music lessons?—Twice a week.A. How longB. How farC. How oftenD. How much

问题补充：

— does he have music lessons?—Twice a week.

A. How long

B. How far

C. How often

D. How much

答案：

A. How long

B. How far

(答案→)C. How often

D. How much

解析：句意：他多久学一次音乐？一周两次。A多久，问时间B多远，问距离C多久一次，问频率D多少，问数量；多少钱，问价钱。