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

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

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

What are they cleaning?

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

What are they cleaning ?