None of us had the final say in this matter, and therefore it was recommended that we ________ for the authorities.
句意：对这件事我们都没有最终决定权，所以最好还是等权威人士出面。表示“建议”之意时recommend后应使用虚拟语气should+动词原形，或是直接使用动词原形。故本题选wait。