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【题目】 to say ." thank you" if you get others' help. It's a way to show your polite(礼貌).

A.To learnB.LearningC.LearnedD.Learn

【答案】D

【解析】

句意:如果你得到了别人的帮助,要学会说谢谢。这是一种体现你礼貌的方式。

本题考查祈使句。to learn是动词不定式,learning是动名词或现在分词,learned是过去分词,learn是动词原形。后面是if引导的条件状语从句,主句是祈使句,动词原形开头,故选D

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