has been amassing
-ha estado acumulando
Present perfect progressivehe/sheconjugation ofamass.

amass

The world has learned of the enormous arsenal of missiles that Hizbollah has been amassing in Lebanon.
El mundo ha conocido del enorme arsenal de misiles que Hezbolá ha estado acumulando en el Líbano.
However, since the 18th century, the Georgian Kingdom has been amassing strength and independence.
Sin embargo, a partir del siglo 18 el reino georgiano empezó poco a poco recuperar la fuerza y la independencia.
The Austrian Riviera: since opening, Schloss Velden, a Capella Hotel by Lake Wörthersee has been amassing international awards.
Riviera austriaca: Schloss Velden, a Capella Hotel en el lago Wörther no para de acaparar premios desde su apertura.
For the five years following this intervention, the artist has been amassing scientific, historic, archaeological and photographic documentation on this cave in the artwork (Ir.
A partir de dicha intervención, y durante cinco años, el artista ha ido reuniendo la documentación científica, histórica, arqueológica y fotográfica de esta cueva en una obra (Ir.
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