科学家认为地球上的生命已经有亿万年了.Scientists think that life on the earth for hundreds of millions of years. 题目和参考答案——青夏教育精英家教网—

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4. 科学家认为地球上的生命已经有亿万年了。

Scientists think that life on the earth for hundreds of millions of years.

4. there has been

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