对划线部分提问.Ther are cleaning their classroom.划线部分是their classroom

问题描述:

对划线部分提问.Ther are cleaning their classroom.划线部分是their classroom

What are they cleaning ?

应该是 they are cleaning their classroom.
what are they cleaning?

Where are they cleaning
有不明白的地方再问哟,更上一层楼!(*^__^*

What are they cleaning?