hayan desaprovechado
-they/you have wasted
Present perfect subjunctiveellos/ellas/ustedesconjugation ofdesaprovechar.

desaprovechar

Tras haberme ocupado del problema de Chipre durante 10 años, no puedo sino lamentar que siga estancado el proceso político y se hayan desaprovechado tantas oportunidades.
Having dealt with the Cyprus issue for 10 years, I cannot but regret the continued stalemate in the political process and the missed opportunities.
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yolk