GMAT Sentence Correction

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Source: GWD

Level: 4

All Y chromosomes in existence today are descended from a single ancestor's who is thought to have lived about 140,000 years ago.

  • A a single ancestor's who is thought to have lived
  • B a single ancestor's who was thought to live
  • C a single ancestor whom it is thought had lived
  • D the Y chromosome of a single ancestor who is thought to have lived
  • E the Y chromosome of a single ancestor whom it was thought had lived

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