they had neglected
-avaient négligé
Past perfect they conjugation of neglect.

neglect

It is as if the designers of a flood mitigation system suddenly discovered, after a disaster, that, in drawing up their plans, they had neglected to take account of water.
C’est comme si les concepteurs d’un système pour atténuer des inondations découvraient soudainement, après une catastrophe, qu’en élaborant leurs plans, ils avaient négligé de prendre en compte l’eau.
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