问题描述：
为什么不选A呢 另外选D的话 逗号前后没有连接词啊 ……………………………………
32.Helpingothers is a habit,_______ you can learn even at an early age.
A.it B.that C.what D.one
32.Helpingothers is a habit,_______ you can learn even at an early age.
A.it B.that C.what D.one
问题解答：
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