jp001 wrote:
Error in (D):
Sixty-five million years ago, according to some scientists, an asteroid bigger than Mount Everest slammed into North America,an event that caused plant and animal extinctions, and it marks the end of the geologic era known as the Cretaceous Period.
we have an Absolute phrase(an event that caused plant and animal extinctions) trying to modifying the entire preceding clause
if we remove this Absolute phrase the sentence will be like this:
Sixty-five million years ago, according
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