An eco-system consists of living and nonliving things in an area________interact with one another.a.that b.where c.who d.what为什么选b呢,

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An eco-system consists of living and nonliving things in an area________interact with one another.a.that b.where c.who d.what为什么选b呢,
An eco-system consists of living and nonliving things in an area________interact with one another.
a.that b.where c.who d.what为什么选b呢,

An eco-system consists of living and nonliving things in an area________interact with one another.a.that b.where c.who d.what为什么选b呢,
An eco-system consists of living and nonliving things in an area _where they_ interact with one another.
由于先行词是area,表示区域、地点,所以引导词用where.另外,原句中似乎少了个they.

错~~~
答案选A， 先行词是living and nonliving things,在定语从句中做主语，不能选 in an area 做先行词，那样的话，定语从句中没有了主语，构不成定语从句了。

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