—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：考查疑问词辨析。根据答语By bike“乘公共汽车”可知，问句是对交通方式提问。须用疑问副词How。故选C。