2. 考研
  3. Early forms of life on Earth, ________ in the absence of oxygen, required elements such as sulfur instead.

Early forms of life on Earth, ________ in the absence of oxygen, required elements such as sulfur instead.

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问题 Early forms of life on Earth, ________ in the absence of oxygen, required elements such as sulfur instead.
选项 A、which lived
B、whose life
C、lived
D、were living
答案A
解析 本题考查非限制性定语从句。分析句子结构可知，整个主句谓语为required，________in the-absence of oxygen为定语。A项which引导非限制性定语从句，指代早期生命形式，从句谓语lived与主句谓语required同属于过去形式，符合句子语法结构，故答案为A项。B项缺少谓语，排除；C项是分词作后置定语，“早期生命形式”与“居住”之间为主动关系，故应用现在分词living作后置定语，lived表达被动语态，不符合语法结构，故排除；D项中were living为谓语形式，不符合句子结构，故排除。
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