john is doing his homework.对划线部分提问 划线部分是 doing his homework.

问题描述:

john is doing his homework.对划线部分提问 划线部分是 doing his homework.
_ _ john _?

答案:【What ,is doing】
【●速度回答,】
【亲!你的10分满意,我们团队的无限动力】