Spanish / completar pluscuamperfecto | Spanish homework help

Completa las oraciones usando la forma correcta del pluscuamperfecto de los verbos entre parntesis. 

1 La efectividad de la vacuna contra la malaria del Dr. Patarroyo, ya __________ (ser demostrada) en Latinoamérica antes de ensayarse en África. 

2 Cuando el grupo de turistas suizos llegó puntual a la Luna, ya hacía días que __________) (llegar) los turistas de Marte. 

3 Horas después de que el meteorito cayera en Siberia, varios testigos (witnesses) ya ____________ (subir) a Internet fotos del impacto. 

4 Cuando comprobé que el invento no funcionaba, recordé un proverbio chino que aun no se _________ (borrar) de mi memoria. 

5 Cuando el químico salió del laboratorio nos dijo que el experimento __________ (contribuir) al avance de la ciencia.

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