— does Grace do her English exercises every day?
—About thirty minutes.
A. How many
B. How much
C. How long
D. How far
网友回答
A. How many
B. How much
(答案→)C. How long
D. How far
解析：How many多少个；How much多少；How long多长；How far多远。根据答语，大约三十分钟。可知上文问的是时间长短，故选C。