Thomas Eakins' powerful style and his choices of subject—the advances in modern surgery, the discipline of sport, the strains of individuals in tension with society or even with themselves—was as disturbing to his own time as it is compelling for ours.
was as disturbing to his own time as it is
were as disturbing to his own time as they are
has been as disturbing in his own time as they are
had been as disturbing in his own time as it was
have been as disturbing in his own time as
you should have a second verb in (e) because the tense changes. in general, if you don't have a second verb, then the implication is that the tense doesn't change.
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