Many resources on GMAT state that first the test taker is supposed to understand the intended meaning of the sentence and then choose the most appropriate answer. I've run into several examples, however, that had the correct answer with a slightly modified meaning.
I. Below is an example from GMACPrep1 question pack:
In undistributed primary forests, the Honduran mahogany grows up to a height of 130 feet, having a buttressed trunk and a crown that spread over the canopy of lesser trees.
A. up to a height of 130 feet, having a buttressed trunk and a crown that spread over the canopy of lesser trees.
D. to a height of 130 feet, with a buttressed trunk and with a crown that spreads.
D is the correct answer. I understand that there is an issue with the relative noun modifier in A.
However, in my opinion the original meaning of the sentence was to say "grows up to 130 feet [in height]", implying a range in height. Saying "grows to a height of 130 feet" indicates that that's the typical height that the tree achieves on average.
The answer explanation also mentioned that "grows up" is redundant since the trees can only grow up. This statement is also confusing to me since the construction "up to" seems to have been used in the original sentence for a different purpose.
II. There were also two other examples.
(An OG13 DT question) "is likely to" was wrong and "more than likely" was right. In that example, "is likely to" was said to be not parallel with the rest of the sentence but "more than likely" carries a completely different degree of certainty to me than "is likely to".
(Another OG13 question) "A and B" in the original sentence was wrong and "A and even B" was right. The word even implies an element of surprise, an addition to the meaning not clearly justified.