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