You've won the first place in the maths contest．Congratulations！A.OK．B.Thank you．C.The same to you．D.I'll do better next time．
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B解析分析：上文Congratulations！是祝贺用语，应该表示感谢。所以选B项。OK．表示同意，和上文不配。The same to you．上文也是祝贺用语，可以先向对方表示感谢，在对方的祝贺语也适用于对方时才可以接着这么说。如：A：Have a great day！B：Thank you．The same to you．I'll do better next time．没有对祝贺作出反应。(延伸)有些祝贺用语适用于双方，如：A：Happy New Year！B：The same to you．(You，too．／Happy New Year！)有些祝贺用语不适用于双方：A：Happy birthday to you！B：Thank you．(不能说The same to you．)