The pupils of Class Three are doing exercises in the gym.用doing exercises提问理由是什么
问题描述：
The pupils of Class Three are doing exercises in the gym.用doing exercises提问理由是什么
答
理由是：提问人想知道三班的学生在健身房干什么 或者 三班的学生在干什么
提问人问的问题应该是：
What are the pupils of class three doing in the gym?
或 what are the pupils of class three doing now?