--- do you spend _English learning every day? ---For about an hour.
A. How long, in
B. How many times, on
C. How often, on
D. How long, on
网友回答
A. How long, in
B. How many times, on
C. How often, on
(答案→)D. How long, on
解析：For+ 一段时间，用How long提问，spend + 时间 + on +名词，题中English为名词，所以选D。