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【题目】Helping others is a habit, _______ you can learn even at an early age.

A.itB.thatC.whatD.one

【答案】D

【解析】

考查代词。句意:---帮助别人是一种习惯,一个你在早年可以学习的习惯。这里需要一个代词指代a habit,用one可以泛指前面的可数名词单数,it特指同类同物,that特指可数名词的单数或不可数名词,what只能引导从句,故选D

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