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

A. it B. that

C. what D. one

【答案】D

【解析】句意：助人為樂是一種習(xí)慣，甚至你可以在很小的時候就可以學(xué)會它。one=a/an+單數(shù)可數(shù)名詞，句中相當(dāng)于a habit，故選D

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