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

試題分析：句意：助人為樂是一種習慣，甚至你可以在很小的時候就可以學會它。one=a/an+單數(shù)可數(shù)名詞，句中相當于a habit，故選D
點評：it／one ／that三者均可用作代詞, 指代前面提到的名詞。一般說來, it指代同名同物; one與that則指代同名異物。one只能代替可數(shù)名詞單數(shù), 代替可數(shù)名詞復數(shù)時用ones ，those; that既可以代替不可數(shù)名詞也可以代替可數(shù)名詞單數(shù), 代替可數(shù)名詞復數(shù)時those。
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