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Sentence Correction: Preposition Questions - Split Constructions

John, who is becoming progressively more obsessive about cleanliness, asks guests to take or thoroughly clean their shoes before they enter his house.

This answer choice is grammatically incorrect.

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Well done!

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This answer choice corrects the original mistake by adding the required preposition off after the verb take.

This answer choice repeats the original mistake.

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Stylistically, this answer choice is better than the original sentence as replacing the three-word phrase before they enter with the two-word phrase before entering is more concise. However, grammar precedes style on the GMAT. A correct answer can be stylistically flawed, but it can NEVER be grammatically incorrect.

This answer choice repeats the original mistake.

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While this answer choice corrects the original Split Construction mistake, replacing shoes with shoe both changes the meaning of the original sentence and creates an illogical sentence. Their shoe implies that John's guests only wear one shoe.

asks guests to take or thoroughly clean their shoes before they enter
asks guests to take or thoroughly clean their shoes before entering
asks guests to take or thoroughly clean their shoes prior to entering
requests that guests take off or thoroughly clean their shoe before they enter
asks guests to take off or thoroughly clean their shoes before they enter