给划线部分提问:The students of class Four are sweeping their classroom.对of class Four 提问.

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给划线部分提问:The students of class Four are sweeping their classroom.对of class Four 提问.
给划线部分提问:The students of class Four are sweeping their classroom.对of class Four 提问.

给划线部分提问:The students of class Four are sweeping their classroom.对of class Four 提问.
Which class's students are sweeping their classroom?