At the party, everybody congratulated the scientist ______ winning the award aft

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问题 At the party, everybody congratulated the scientist ______ winning the award after his years of hard work.

选项 A、to
B、on
C、at
D、about

答案 B

解析本题考查的是介词搭配问题。congratulate sb．on sth．意思是“为某事向某人表示祝贺”，符合句意，故选项B为正确答案。

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