－ are you going to be a math teacher? －I must study hard at math from now on.A. WhyB. HowC

问题补充：

－ are you going to be a math teacher? －I must study hard at math from now on.

A. Why

B. How

C. When

D. What

答案：

A. Why

(答案→)B. How

C. When

D. What

解析：本题的回答语含义是从现在开始我必须要努力学习，是打算成为一名数学老师的方式，对方式提问的用how，故本题选B。