An excellent teacher is believed to be one who devotes himself to the children but asks for nothing .
A. in return
B. in advance
C. in short
D. in turn
网友回答
(答案→)A. in return
B. in advance
C. in short
D. in turn
解析：介词词义辨析。A作为回报；B提前；C简言之；D一次，轮流；句意：一个优秀的老师被认为应该是一个热爱学生但是却不希望得到回报的人。根据句意说明A正确。