Bunuel
In 1978 a national study found that not only had many contractors licensed by a self-policing private guild failed to pass qualifying exams,
they in addition falsified their references.
(A) they in addition falsified their references
(B) they had their references falsified in addition
(C) but they had also falsified their references
(D) they had also falsified their references
(E) but their references were falsified as well
The correct idiom is
Not only... But also
Not only.. But
A simple trick is whenever you have Not only X but also Y kind of format where x and y need to be parallel, ignore the part from
not only... But and see if sentence makes sense.
Let's try this on C and E
C) In 1978 a national study found that they had also falsified their references
Fits the bill
E) In 1978 a national study found that their references were falsified as well
Who falsified? No doer---> changes he intended meaning.
So C imo
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