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aragonn

Project SC Butler: Day 94: Sentence Correction (SC1)


For SC butler Questions Click Here

Paleontologists studying the fossil record have estimated that the current collection of known fossils accounts for only approximately 10% of all species that have ever existed.

A. studying the fossil record have estimated that the current collection of known fossils accounts for only approximately 10% of all species that
B. that study the fossil record have estimated that the current collection of known fossils is only 10% of all species that
C. studying the fossil record have estimated that the current collection of known fossils accounts for only 10% of all species that
D. who study the fossil record have estimated that the fossils currently collected are only approximately 10% of all species which
E. who study the fossil record estimate that the current collection of known fossils accounts for approximately 10% of all species which

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There may be no best/excellent answers, or a there may be a few excellent answers!

Official Explanation:


Since the underlined portion of the sentence contains the word approximately, check whether this word is consistent with the rest of the sentence. The words estimated and approximately are both used in the sentence, even though they have similar meanings and only one is needed. This is a redundancy error, so eliminate choice A and look for any obvious repeaters. Choice D is an obvious repeater since it contains the words estimated and approximately, so eliminate choice D. Now evaluate the remaining answer choices individually, looking for reasons to eliminate each.

Choice B fixes the redundancy error by removing approximately, but incorrectly uses the pronoun that (rather than who) to refer to paleontologists, so eliminate choice B. Choice C fixes the original redundancy error by removing the word approximately, and introduces no new errors, so keep choice C. Choice E uses both estimate and approximately, which is redundant, so eliminate choice E.

Choice A: No. The use of both estimated and approximately is redundant. Redundancy.

Choice B: No. The use of that to refer to paleontologists is incorrect. Pronoun agreement.

Choice C: Correct

Choice D: No. The use of both estimated and approximately is redundant. Redundancy.

Choice E: No. The use of both estimate and approximately is redundant. Redundancy.

The correct answer is choice C.
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someone, please explain why which should be preceded by a comma?
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