GMAT Test Prep: SC-45135298 GMAT Sentence Correction | TOEFL IELTS GMAT GRE SAT ACT PTE ESL

A were beings that were part of a rich and highly advanced civilization that was Sumerianspeaking

B had been part of a rich and highly advanced civilization of beings that were Sumerian-speaking

C were part of a rich and highly advanced civilization of Sumerian-speaking beings

D had been beings that were part of a rich and highly advanced civilization that was Sumerianspeaking

E were a group of beings which had been part of a rich, highly advanced Sumerian-speaking civilization