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"Soyez le bienvenu", "soyez la bienvenue", "soyez les bienvenus", "je vous souhaite la bienvenue"
Explanation: (or "nous vous souhaitons la bienvenue") The last greeting is usually shortened to "bienvenue", which you will hear most of the time. But if you want to sound sophisticated or if you prefer more official greetings, you may use any of the above.