问题描述：
it能放在逗号后做同位语吗?
32.Helping others is a habit,____d___ you can learn even at an early age.
A.it B.that C.what D.one
为什么不选A
32.Helping others is a habit,____d___ you can learn even at an early age.
A.it B.that C.what D.one
为什么不选A
问题解答：
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