Correcting Errors Involving Commonly Confused Words - GMAT Verbal

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Question

Replace the underlined portion with the answer choice that results in a sentence that is clear, precise, and meets the requirements of standard written English.

The most likely explanation of such phenomenon is which geothermal forces under the earth produce the odd sights.

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Answer

The use of "which" in the underlined portion of the sentence is incorrect, as which should only be used to refer to things that are not necessary parts of the sentence. The appropriate word choice in this context is "that," making the correct answer choice "that geothermal forces under the earth produce the odd sights."

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