From Gmat Prep ver 1, the correct answer was (slightly rephrased for brevity):
One automobile manufacturer has announced plans to increase fuel efficiency by 25%, an increase that would amount to roughly 5 mpg and would represent the first major advance in over a decade.
Now, per MGMAT, parallel clauses must always start with the same word. So in this case, it should be "an increase that X, and that Y" instead of "an increase that X, and Y". A specific example from MGMAT: Chapter 4, 3rd edition, page 63: "She argued THAT the agency acted recklessly and THAT it should be shut down."
The missing THAT in the answer choice made me pick an incorrect answer. I would like to know if MGMAT got it wrong or overly restrictive on this one. In other words, is it _preferable_ to have a THAT here or is it a MUST HAVE (and GMAT screwed up) or it varies on a case-by-case basis?
One automobile manufacturer has announced plans to increase fuel efficiency by 25%, an increase that would amount to roughly 5 mpg and would represent the first major advance in over a decade.
Now, per MGMAT, parallel clauses must always start with the same word. So in this case, it should be "an increase that X, and that Y" instead of "an increase that X, and Y". A specific example from MGMAT: Chapter 4, 3rd edition, page 63: "She argued THAT the agency acted recklessly and THAT it should be shut down."
The missing THAT in the answer choice made me pick an incorrect answer. I would like to know if MGMAT got it wrong or overly restrictive on this one. In other words, is it _preferable_ to have a THAT here or is it a MUST HAVE (and GMAT screwed up) or it varies on a case-by-case basis?
