--- do you study for a math test? ---I study math lots of exercises.
A. What, by doing
B. How, by doing
C. How, doing
D. What, doing
网友回答
A. What, by doing
(答案→)B. How, by doing
C. How, doing
D. What, doing
解析：考察特殊疑问词的意思和介词， “what”什么“how”怎样，如何“By”通过。句意：你为了数学考试时如何学习的？我通过做许多练习学数学。故选B