2. 外语
  3. Fossil records indicate ______existing in the past have become extinct.

Fossil records indicate ______existing in the past have become extinct.

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问题 Fossil records indicate ______existing in the past have become extinct.
选项 A、that many species of organisms
B、many species of organisms that
C、many species of organisms are
D、there are many organisms
答案A
解析 句子结构题。本句的第一层次是一个宾语从句，即fossil records indicate that…；宾语从句中的谓语动词是have become，主语是many species of organisms，existing in the past是主语的定语，其他选项均不符合语法。
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