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Helping others is a habit, _____ you can learn even at an early age.
A.itB.that C.whatD.one
D

试题分析:句意:助人为乐是一种习惯,甚至你可以在很小的时候就可以学会它。one=a/an+单数可数名词,句中相当于a habit,故选D
点评:it/one /that三者均可用作代词, 指代前面提到的名词。一般说来, it指代同名同物; one与that则指代同名异物。one只能代替可数名词单数, 代替可数名词复数时用ones ,those; that既可以代替不可数名词也可以代替可数名词单数, 代替可数名词复数时those。
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