题目选项分析

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

From a cache of burnt bones, including bone tools, found in South Africa, Homo erectus is estimated to have controlled fire 700,000 years ago, and other hominid groups even had mastered fire earlier