had been racking
Past perfect progressiveconjugation ofrack.There are other translations for this conjugation.

rack

So long he had been racking his brains along with his sister Anita and her husband John to offer a high quality gourmet food and that was the reason for the advent of Kermit's Key West Key Lime Pie Shoppe.
Mientras él había estado acumulando sus cerebros, junto con su hermana Anita y su esposo Juan para ofrecer una comida gourmet de alta calidad y que fue la razón de la llegada de Kermit de Cayo Hueso Key Lime Pie Shoppe.
A feeling of unease had been racking me all day.
Una sensación de malestar me había atormentado todo el día.
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