The official language of the West African Development Bank is English. This is because English is the lingua franca of West Africa, and it is the language that is used in most official communications in the region. French is also widely spoken in West Africa, but it is not the official language of the West African Development Bank. Portuguese is spoken in some parts of West Africa, but it is not the official language of the West African Development Bank. Arabic is not spoken in West Africa, and it is not the official language of the West African
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