-- do you read English newspapers？I read 21st Century every day. A How long B How often

问题补充：

-- do you read English newspapers？

--I read 21st Century every day.

A How long B How often C How many D How much

答案：

解析：疑问词辨析。How long多长，提问时间长短；How often多久一次； How many多少个； How much多少钱。根据下文，我每天读21世纪。可知上文提问频率，故选B，你多久读一次英文报纸？