[quote="catgmat"]Warsaw began to rebuild not only [u]with brand-new structures, injecting a much-needed boost to the local economy, and also painstaking reconstructions of the old ones[/u] that had been demolished.
A. with brand-new structures, injecting a much-needed boost to the local economy, and also painstaking reconstructions of the old ones
B. with brand-new structures, injecting a much-needed boost to the local economy, as well as painstaking reconstructions of the old ones
C. brand-new structures, injecting a much-needed boost to the local economy, but also painstaking reconstructions of the old ones
D. brand-new structures, injecting a much-needed boost to the local economy, but also painstakingly reconstructing the old ones
E. brand-new structures, injecting a much-needed boost to the local economy, but they also began painstakingly reconstructing the old ones[/quote]
(C)
A-incorrect use of idiom "not only... but also"
B-incorrect use of idiom "not only... but also"
C-correct; idiom "not only ADJ+NOUN....but also ADJ+NOUN
D-the elements of the idiom are not grammatically parallel
"...not only ADJ+NOUN.... but also ADVERB+VERB"
E-incorrect use of idiom "not only... but also" (the pronoun 'they' should be removed)