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Choose the word or set of words for each blank that best fits the meaning of the sentence as a whole.

There are as yet no vegetation types or ecosystem whose study has been ____________ to the extent that they no longer ____________ ecologists.

  1. Perfected, hinder
  2. Exhausted, interest
  3. Prolonged, require
  4. Prevented, challenge
  5. Delayed, benefit.

2 Answers

Best answer
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The sentence should mean, ecosystem still interest ecologists despite vast studies. So, option 2.
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