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It’s polite ______ “Thank you” when you receive something from someone.

A.saysB.sayC.sayingD.to say

D

解析试题分析:句意:当你从别人那里收到东西的时候说“谢谢”是礼貌的。says 第三人称单数形式;say 说,原形;saying 动名词;to say动词不定式。这里使用的句型是It is +形容词+to do sth.做某事是……的。故选D。
考点:考查非谓语动词。

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