estaban pavimentando
-they/you were paving
Imperfect progressive ellos/ellas/ustedes conjugation of pavimentar.

pavimentar

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Había por lo menos seis carreteras, todas en el lado este del muro, de unos 33 kilómetros de longitud, que se estaban pavimentando o ensanchando para el uso exclusivo de un pequeño grupo de colonos.
There were at least six roads, all on the eastern side of the wall, reaching some 33 kilometres in length, being paved or widened for the exclusive use of a small group of settlers.
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