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.

(A) was as disturbing to his own time as it is

(B) were as disturbing to his own time as they are

(C) has been as disturbing in his own time as they are

(D) had been as disturbing in his own time as it was

(E) have been as disturbing in his own time as

hile D uses the past tense was to characterize something that is happening in the present.

D前面用过去完成时态不知对不对?????????

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.

请问：破折号后并列三个名词词组，为什莫在最后 ，the strains 之前没加and 哪？