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Sequence of events:
1. Willis tower was the tallest
2. Taipei Tower was completed
3. Willis lost its distinction to Taipei

POE:

Option A is incorrect for conveying incorrect meaning.
(W Losing distinction to the completion of T)

The use of past perfect in B is incorrect. It means that the distinction was lost before Willis tower was the tallest.

The incorrect use of being in option C.

Between option D and E, option D is concise and clear.
(Completion v/s completed, verb is more preferable than noun)

D is the correct answer

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Chicago's Willis Tower, formerly the Sears Tower, was the tallest office building in the world until losing that distinction to the completion of the Taipei 101 Tower in 2004.

POE:
Eliminate (A) & (E) - change of meaning.
Eliminate (B) - tense error, double past is not required here.
Eliminate (C) - 'being' is redundant on GMAT.


A) until losing that distinction to the completion of the Taipei 101 Tower

B) until it had lost that distinction upon the completion of the Taipei 101 Tower

C) until that distinction was lost after the Taipei 101 Tower's being completed

D) until it lost that distinction when the Taipei 101 Tower was completed - CORRECT

E) until the loss of that distinction after the completion of the Taipei 101 Tower
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Chicago's Willis Tower, formerly the Sears Tower, was the tallest office building in the world until losing that distinction to the completion of the Taipei 101 Tower in 2004.


A) until losing that distinction to the completion of the Taipei 101 Tower // Chicago's Willis Tower lost that distinction to the Taipei 101 Tower, not to the completion of that tower.

B) until it had lost that distinction upon the completion of the Taipei 101 Tower // why past perfect tense? that distinction did not happen before any event mentioned in the sentence.

C) until that distinction was lost after the Taipei 101 Tower's being completed // passive voice creates ambiguity, who lost that distinction? plus, why use a modifier that implies continuity, "being completed", instead of a noun form, "completion"

D) until it lost that distinction when the Taipei 101 Tower was completed // grammatically correct. well, I wish it was clarified in the sentence that it lost that distinction to the Taipei 101 Tower because the completion of the Taipei 101 Tower may just be a coincidence. Fortunately, there is no other option left.

E) until the loss of that distinction after the completion of the Taipei 101 Tower // who lost that distinction and to whom it lost? grammatically correct but vague.
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The official explanation is here.
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