EXERCISE 7:EXERCISE 7:

5. No one knows what colour dinosaurs were. No sample of their skin has survived.A. Because no one knows what colour dinosaurs were, no sample of their skin has survived.B. No sample of dinosaurs

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skin has survived because no one knows what colour they were.C. Because no one knows what colour dinosaurs were which is because no sample of their skin has survived.D. No one knows what colour dinosaurs were because no sample of their skin has survived.