We congratulated him his getting a gold medal.That is to say: we offered him our congratulations his getting a gold medal.
A. at;on
B. of;on
C. on;for
D. on;on
网友回答
A. at;on
B. of;on
C. on;for
(答案→)D. on;on
解析：congratulate sb.on/upon （doing） sth.意为“为某事祝贺某人”。congratulation通常用复数congratulations，其后多用介词on。