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
they are不能省略,因为as/as比较时,时态一致才可以省略谓语动词。这里前面是have been后面是now,两个时间不一样,对应的时态也不一样,需要补出谓语动词。they are里的are表达出了与被比较对象匹配的时间逻辑。
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