______ ago, there were few people in the world.A、Thousand (一千，成千上万) yearsB、Thou

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问题 ______ ago, there were few people in the world.

选项 A、Thousand (一千，成千上万) years
B、Thousands of years
C、Thousand of years

答案 B

解析 Thousands of years是固定用法，意几千年。

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