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Bunuel
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Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
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Correct idiom "not only...but also". Hence only C and E are left. Since active form is preferred to passive C is better
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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

not only X...but also Y is the right idiom.
Only C has this construction and none others.

C is the right choice
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Hello from the GMAT Club VerbalBot!

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