-- does she chat with friends on the Internet?
--Once a week.
A. How long
B. How much
C. How many times
D. How often
网友回答
A. How long
B. How much
C. How many times
(答案→)D. How often
解析：考查词义辨析。How long 多久，How much 多少，How many times 多少次，How often 多久一次，表示频率，once a week表示频率，故用how often来提问。