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avaient disparu

had disappeared

→ avoir
phrase Rare #47,394
had disappeared Used with a plural subject; it is the pluperfect form of “disappear.”
FR: À notre arrivée, les oiseaux avaient disparu.
EN: When we arrived, the birds had disappeared.

Deux autres deux-mâts avaient disparu sans laisser de trace.

Two other two-masted ships had disappeared without a trace.

Quand je suis revenu, les sequins avaient disparu.

When I returned, the sequins had disappeared.

— Pinocchio (2019)

Trois voyageurs, Passepartout compris, avaient disparu.

Three travelers, including Passepartout, had disappeared.

J'ai découvert que les torpilles avaient disparu des dossiers officiels.

I discovered that the torpedoes had disappeared from the official records.

— Star Trek Into Darkness (2013)