prep2-117 关于并列句省略问题

Constructed at least as early as the Sui dynasty(A.D. 581-618), the Altar of Heaven is the oldest known altar used in Chinese stte religious practice, more than 1000 years older than a similar one in Beijing, it is the only altar found so far that predates the Qing dtnasty(A.D. 1644-1912).

B. Constructed at least as early as the Sui dynasty(A.D. 581-618), the Altar of Heaven, the oldest known altar used in Chinese state religious practice, is more than 1000 years older than a similar one in Beijing and is

用排除法，答案是B没有问题，我想法问的是这边并列句 is more than 1000 years older than a similar one in Beijing and is.... 这边前后is不是都做系动词吗？按照并列句省略规则前后功能一样的BE动词不是要省略吗？

没人回答啊，up

(Constructed......,) the A of H, (the oldest...,) is more than ...and is only....

is...and is... 貌似挺平行的哇，第二个is 暗示后面引导的部分就是针对the A of H这个对象，结构清晰对称~~为什么非要省略类？

浅见~~