—do you read English books? —Twice a day. A. How many B. How much C. How often

问题补充：

—do you read English books? —Twice a day.

A. How many B. How much C. How often

答案：

解析：How many多少个,修饰可数名词复数;How much多少,修饰不可数名词;How often多久一次.根据下文,一天两次.可知上文问的是,你多久读一次英语书?故选C.