has been piecing
Present perfect progressivehe/sheconjugation ofpiece.

piece

For nearly eight years, the VIsible MultiObject Spectrograph (VIMOS) on ESO's Very Large Telescope (VLT) in Chile has been piecing together a three-dimensional map of galaxies in two patches of the southern sky.
Durante casi ocho años, el instrumento VIMOS (VIsible MultiObject Spectrograph), instalado en el Very Large Telescope (VLT) de ESO en Chile, ha armado un mapa tridimensional de las galaxias de dos zonas del cielo austral.
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