作业帮Why did early men use fire?（保持句意不变） __ did early men use fire __?
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Why did early men use fire?（保持句意不变） __ did early men use fire __?
Why did early men use fire?（保持句意不变） __ did early men use fire __?
Why did early men use fire?（保持句意不变） __ did early men use fire __?
what did early men use fire for?
what for