The word "it" in line 3 refers to According to the passage, it is believed that the largest extinction of a species occurred

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问题  The word "it" in line 3 refers to
  According to the passage, it is believed that the largest extinction of a species occurred

选项 A、26 million years ago
B、65 million years ago
C、225 million years ago
D、250 million years ago

答案C

解析
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