People began to use fire millions of years ago.对划线部分提问
划线部分：millions of years ago
人气：165 ℃ 时间：2020-03-28 19:19:17
解答
When did people begin to use fire?
祝你学习进步,更上一层楼!(*^__^*)
有不会的可以再问我:）
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