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Sentence Correction: Pronoun Questions - Overview and Grammatical Mistake

Once the archaeologists dug and cleaned the artifact, they were surprised to find that it was not an antiquity, but rather a modern day object.

This answer choice repeats the original mistake.

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This answer choice is grammatically incorrect.

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Very good!

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This answer choice corrects the original mistake by adding the required preposition up after the verb dug.

While this answer corrects the original Split Construction mistake, it is grammatically incorrect. Changing the singular noun artifact to the plural artifacts creates a pronoun agreement mistake. The singular pronoun it does not agree with the plural noun artifacts to which it refers.

This answer choice repeats the original mistake.

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In addition, changing the singular noun artifact to the plural artifacts creates a pronoun agreement mistake. The singular pronoun it does not agree with the plural noun artifacts to which it refers.

Once the archaeologists dug and cleaned the artifact, they were surprised to find that it was not an antiquity, but rather a modern day object
Once the archaeologists dug up and cleaned the artifact, they were surprised to find that it was not an antiquity, but rather a modern day object
Once the archaeologists dug and cleaned the artifact, they were surprised to find that it was a modern day object rather than an antiquity
After the archaeologists dug up and cleaned the artifacts, they were surprised to find that it was not an antiquity, but rather a modern day object
After the archaeologists dug and cleaned the artifacts, they were surprised to find that it was not an antiquity, but rather a modern day object