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Sentence Correction (SC) | Re: Biologists worry that the Arctic ecosystem will unravel quickly

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jzqmah wrote:

Biologists worry that the Arctic ecosystem will unravel quickly, citing the fact that the average temperature within the Arctic circle is alreadytwo degrees warmer than ten years ago .

A. two degrees warmer than ten years ago
B. warmer by two degrees than ten years ago
C. two degrees warmer than it was ten years ago
D. two degrees warmer than it had been ten years ago
E. warmer, two degrees so, than ten yearsago

[Reveal] Spoiler:
Originally I choose D.

The answer key says "Past perfect “had been” cannot be used in the absence of another past tense event."
^can someone explain this further?

Can someone explain/show how "D" could be the right answer? Ex. with a past tense event


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