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  3. Early forms of life on Earth, ______ in absence of oxygen, required other elements.

Early forms of life on Earth, ______ in absence of oxygen, required other elements.

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问题 Early forms of life on Earth, ______ in absence of oxygen, required other elements.
选项 A、which lived
B、that lived
C、lived
D、were living
答案A
解析 该题的考点是关于非限制性定语从句。本句中，该从句修饰主语early forms of life。非限制性定语从句中关系代词which不能省略，且that不能引导非限制性定语从句。
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