has been slaving
Present perfect progressivehe/sheconjugation ofslave.

slave

This is where Jean Baptiste Guichesseux has been slaving over the hob for the last two years after first refining his skills during a four-year stint at Ducasse in Paris.
Desde hace dos años se encuentra aquí Jean Baptiste Guichesseux en los fogones, antes perfeccionó su oficio durante cuatro años en Ducasse, Paris.
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