问题描述：
一个托福英语语法问题?
Only 0.1 pecent of the species that have lived on earth have survived to the present,and it was largely chance that determined which species survived and which died out.中间那个chance为什么不加冠词a或the
Only 0.1 pecent of the species that have lived on earth have survived to the present,and it was largely chance that determined which species survived and which died out.中间那个chance为什么不加冠词a或the
问题解答：
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