Possible Results:
había sustentado
Past perfect yo conjugation of sustentar.
había sustentado
Past perfect él/ella/usted conjugation of sustentar.

sustentar

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2,000+ learners.
La moneda se había sustentado en parte en un diferencial de los tipos de interés favorable al dólar.
It had been the interest rate differential favouring the dollar that had partially been supporting the currency.
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to steam up