题目选项分析

Geological evidence relating to the so-called "Face on Mars" dates back to 8,500 B.C. and reveals that the humanoid inhabitants of Mars at that time were part of a rich and highly advanced civilization of Sumerian-speaking beings

Geological evidence relating to the so-called "Face on Mars" dates back to 8,500 B.C. and reveals that the humanoid inhabitants of Mars at that time had been part of a rich and highly advanced civilization of beings that were Sumerian-speaking