beelected后面加什么介词

be elected 后面加介词as，表示“被选为…，被选当…”之意，相当于be elected to be，二者可以互换，例如：

He was elected as chairman of the meeting.他被选为这次大会的主席（本句中，be elected后面加了介词as，表示“当/是大会的主席”，此句可以替换为He was elected to be chairman of the meeting.）