We congratulated him ______ his getting a gold medal.That is to say: we offered him our congratulations ______ his getting a gold medal.A.at;onB.of;onC.on;forD.on;on
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D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。