The sentence given is: "Il faut traduire de français en anglais."
To complete this sentence with the appropriate French word, you would need to fill in the blank with the word "le" or "l'." This is because "traduire" in French requires a direct object. In this case, "le" or "l'" would be used to indicate the direct object being translated, which is not explicitly mentioned but implied in this context.
So, the completed sentence would be: "Il faut le traduire de français en anglais." or "Il faut l' traduire de français en anglais."
These words indicate that something specific needs to be translated from French to English without specifying the exact noun being translated. This is a common construction in French when the direct object is understood from the context.
