Be appointed manager 和 be promoted to manager

Be appointed manager：是任命的经理
be promoted to manager：将会升任为经理（be promoted to —— 被动式动词词组）
再问： 亲 我问的是 为什么appoint后便不加介词 谢谢
再答： 因为这里不需要。to appoint 通常接双宾语（所谓直接和间接宾语）：I appointed John the manager of the sales department. 当用被动式表达时，直接宾语做主语，间接宾语留在宾语的位置，无需介词：John was appointed the manager of the sales department. to promote sb to...是动词词组，介词是其中一部分。所以在变成被动式以后，介词 to 必须保留。