It is greatly that he gave back the money he found on the bus.
A. for his delight
B. to his delight
C. to his credit
D. in his credit
网友回答
A. for his delight
B. to his delight
(答案→)C. to his credit
D. in his credit
解析：考查固定搭配to one’s delight让某人高兴的是…；to one’s credit值得赞扬的是…；句意：值得赞扬的是他把在车上发现的钱还了回去。故C正确。