had been costing
-había estado costando
Past perfect progressiveconjugation ofcost.There are other translations for this conjugation.

cost

In other words, it had been costing more and more in United States dollars to make payments in Swiss francs for the Commission's expenditures.
Dicho de otro modo, han hecho falta cada vez más dólares para cubrir los gastos de la Comisión de Derecho Internacional en francos suizos.
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