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这句话该怎么分析 To what extent competition determines the compositi

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这句话该怎么分析 To what extent competition determines the composition of a
To what extent competition determines the composition of a community and the density of particular species has been the source of considerable controversy.
to what 是什么用法,determines 和 has 哪个是位于,请分析的详细一些,
这句话该怎么分析 To what extent competition determines the compositi
To what extent competition determines the composition of a community and the density of particular species(主语) has been(系动词) the source of considerable controversy(表语).
-------你的句子是主语从句.
To what extent competition determines the composition of a community and the density of particular species 是从句部分做主语,the source of considerable controversy是主句部分.
再问: 谢谢分析,结构明白了,从句部分为什么TO可以提前,这是什么用法,这个从句部分没怎么看明白
再答: To what extent 是程度状语。在从句部分必须放在句首,如同这个句子:
How we will go hasn't been decided yet 。 又如
To what extent / degree she likes him is already clear.