they had collaborated
-avaient collaboré
Past perfect they conjugation of collaborate.

collaborate

All the countries reported that they had collaborated closely with the chemical industry and other relevant entities and exchanged information on legitimate commercial needs for precursor chemicals, unusual trends and suspicious transactions.
Tous les pays ont signalé avoir collaboré étroitement avec l'industrie chimique et d'autres entités concernées et avoir échangé des informations sur les besoins commerciaux légitimes de précurseurs chimiques, les tendances inhabituelles et les opérations suspectes.
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