If it says "that December", I would understand that it was an action that started and finished in the past. Therefore, past simple would be the appropriate tense to use, not the present perfect.
17 januari 2021
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You're welcome! šš¼
17 januari 2021
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Heb je je antwoorden nog steeds niet gevonden?
Schrijf je vragen op en laat de moedertaalsprekers je helpen!