【2008.10】The President was among the first to congratulate the s

【2008.10】The President was among the first to congratulate the scientist ______ his new discovery．
A、at
B、in
C、about
D、on
【正确答案】：D
【题目解析】：本题考查介词的固定搭配。congratulate sb on sth：祝贺某人某事。