题目选项分析

From a cache of burnt bones, including bone tools, found in South Africa, Homo erectus had estimated control of fire 700,000 years ago, although other hominid groups might have even mastered fire earlier.

From a cache of burnt bones, including bone tools, found in South Africa, it is estimated that Homo erectus had control of fire 700,000 years ago, although other hominid groups might have mastered fire even earlier