has been stocking
Present perfect progressive he/she conjugation of stock.

stock

Since 1986 MetalDetector.com has been stocking, selling and supporting Garrett's full line of both security and hobby detectors.
Desde 1986 MetalDetector.com ha tenido en stock, venta y ofrecido soporte a toda la línea de Garrett tanto para seguridad como para detectores de hobby.
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