It’s polite ______ “Thank you” when you ...

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

A. says B. say C. saying D. 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。

考点分析：

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