Last year, land values in most parts of the pinelands rose almostso fast. and in some parts even faster than what they did outside the pinelands.
(A) so fast, and in some parts even faster than what they did - use of so fast - idiom error , parallelism error - land values is a noun phrase and what they did is a clause ;
the phrase in some parts even fast .. faster should be followed by comma
(B) so fast, and in some parts even faster than, those - Parallelism issue in both X and Y
(C) as fast,
...
(A) so fast, and in some parts even faster than what they did - use of so fast - idiom error , parallelism error - land values is a noun phrase and what they did is a clause ;
the phrase in some parts even fast .. faster should be followed by comma
(B) so fast, and in some parts even faster than, those - Parallelism issue in both X and Y
(C) as fast,
...
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