CHOOSE THE CORRECT OPTION
Correct answer: D. Some two thousand million years ago this rare event took place
- A. Some two thousand million years ago this rare event has taken place.
- B. Some two thousand million years before this rare event took place
- C. Some two thousand million years ago this rare event had taken place.
- D. Some two thousand million years ago this rare event took place
Explanation
The correct answer is: Some two thousand million years ago, this rare event took place.The sentence describes an event that occurred in the distant past, and the verb tense should be simple past ("took place").
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