When I got home,my mother is busy ____ the floor.

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WhenIgothome,mymotherisbusy____thefloor.WhenIgothome,mymotherisbusy____thefloor.WhenIgothome,mymothe

When I got home,my mother is busy ____ the floor.
When I got home,my mother is busy ____ the floor.

When I got home,my mother is busy ____ the floor.
mopping be busy doing 的句式.忙于做某事