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

A.itB.thatC.whatD.one

【答案】D

【解析】

考查代詞。句意：---幫助別人是一種習慣，一個你在早年可以學習的習慣。這里需要一個代詞指代a habit，用one可以泛指前面的可數(shù)名詞單數(shù)，it特指同類同物，that特指可數(shù)名詞的單數(shù)或不可數(shù)名詞，what只能引導從句，故選D。

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