(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
Solution:
Idioms
“Not only X, but also Y” is the correct idiom.
C is the only choice that is idiomatic.
Rest all are unidiomatic.
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