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

A.To learnB.LearningC.LearnedD.Learn

【答案】D

【解析】

句意:如果你得到了別人的幫助,要學(xué)會(huì)說(shuō)謝謝。這是一種體現(xiàn)你禮貌的方式。

本題考查祈使句。to learn是動(dòng)詞不定式,learning是動(dòng)名詞或現(xiàn)在分詞,learned是過(guò)去分詞,learn是動(dòng)詞原形。后面是if引導(dǎo)的條件狀語(yǔ)從句,主句是祈使句,動(dòng)詞原形開(kāi)頭,故選D。

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