题目选项分析

From a cache of burnt bones, including bone tools, found in South Africa, 700,000 years ago, Homo erectus is estimated as having controlled fire, with other hominid groups even having mastery 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