They’re having a picnic in the park.（划线提问,划在having a picnic 这里!）
问题描述：
They’re having a picnic in the park.（划线提问,划在having a picnic 这里!）
答
What are they doing
他们在做什么？
答
原句为 他们正在公园里野餐
划线为 在野餐 having a picnic
提问应当是他们在公园里做什么
What are they doing in the park？
答
What are they doing in the park?
答
What are they doing in the park?
望采纳，谢谢~
答
What are they doing in the park?
答
what arethey doing in the park