— is your favorite sport? — Swimming.A. WhatB. WhoC. WhoseD. Which

问题补充：

— is your favorite sport?

— Swimming.

A. What

B. Who

C. Whose

D. Which

答案：

(答案→)A. What

B. Who

C. Whose

D. Which

解析：四个选项分别表示什么、谁、谁的和哪一个，根据题意你最喜欢的运动是什么？选A。