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答案：
A
选C
分词短语、介词短语、形容短语在句首，要求后面主句主语立马给出并且是能发出该短语的具体化名次。很明显，只有人类学家能发出”使用高科技”这个动作，“这些人类祖先”还不能使用高科技。
A，正确。主谓宾语从句that不能省，句意，结构，正确，就不轻易变了。意思为：人类学家讨论到，这些人类祖先的听觉可能与今天的人类相似，他们利用数字技术增强了五个史前原始人类的头骨碎片，这些头骨碎片可以追溯到35万多年前。
B，句子残缺，so前后句子不完整，逻辑不对。
C，缺连词。
D，缺连词，句子不成立，these human ancestors不能使用高科技，these多余。
E，these human ancestors不能使用高科技，these多余。且by anthropologists to have had用法错误，过去式，are也错。
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