Wortino

antreten: haben or sein? Perfect tense: hat angetreten

In English: to begin, to set out on; to line up · B1

The answer

In the Perfekt, antreten takes: haben

Perfekt auxiliary
haben
Partizip II
angetreten
Perfekt
hat angetreten

Wortino stores one auxiliary per verb; some verbs can take both depending on the meaning.

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