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Do not keep adding fluid. It sounds like either the master cylinder or the slave cylinder is leaking internally. You will need to have them replaced. If too much fluid was lost it is very possible that you will have to replace the clutch due to fluid-soaked clutch disc.
You may just need to replace the two cylinders, however if you keep adding fluid and trying to bleed it or attempt to drive, it will get only worse. Do not keep adding fluid.