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GMAT Question of the Day – 4/1/2021


So substantial has been the increase in demand for treehouses that the world’s leading treehouse builder will build over 150 treehouses next year, up from three in 2007.



The sentence as written contains no grammatical errors. So substantial has been X that Y is an accepted construction. Other acceptable forms would be So substantial has X been that Y, or X has been so substantial that Y. There is no reason for the correct answer to switch to one of these other forms, but be aware that it could do so.

A quick scan of the choices doesn’t reveal any useful grouping. Proceed to take a closer look at the choices.

(B) creates a redundancy by using “so” twice for the same purpose. (B) would have been fine had it said, The increase in demand for treehouses has been so substantial that…. As is, however, (B) must be eliminated.

(C) makes no sense when read into the sentence: “The increased demand … has been such, the world’s leading….” The sentence is now missing a connector between the first clause and the second. Eliminate (C).

(D) and (E) use “such … has been” incorrectly. The phrase such has beenis used to mean this is how things are, not to convey that the quantity of something is great enough to lead to a certain result. For example, the phrase is used correctly in Such has been my life, or Such has been the history of this country. With this question, however, the sentence is trying to say that the increase in demand has been great enough to lead to much more work for the leading builder. “Such … has been” is therefore inappropriate here. Eliminate (D) and (E). Then (A) is correct!

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