"It is known that the doctor helped many persons."
Translation:Se știe că doctorul a ajutat multe persoane.
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It doesn't sound natural for me..."pe", along with the verb "a ajuta", is basically used when referring to someone specific (for example: "Doctorul i-a ajutat pe acei oameni." - The doctor helped those people; "Doctorul a ajutat-o pe Maria." - The doctor helped Maria). In the Duolingo sentence, the doctor helped many people, but nobody knows what people he helped. The main idea is that he helped people.