-do you go to work every day? -By bike.A. WhatB. WhoC. HowD. When

问题补充：

-do you go to work every day?

-By bike.

A. What

B. Who

C. How

D. When

答案：

A. What

B. Who

(答案→)C. How

D. When

解析：句意：--你每天如何去上班？--骑自行车。分析：答语是by+交通公具，用how来提问。故选 C