关于OG 12 ---5又出现了新问题

xingxc11

Diabetes, together with its serious complications,
ranks as the nation’s third leading cause of death,
surpassed only by heart disease and cancer.
(A) ranks as the nation’s third leading cause of
death, surpassed only
(B) rank as the nation’s third leading cause of death,
only surpassed
(C) has the rank of the nation’s third leading cause
of death, only surpassed
(D) are the nation’s third leading causes of death,
surpassed only
(E) have been ranked as the nation’s third leading
causes of death, only surpassed
这道题我对答案没有疑惑，只是对OG的解释：Th e phrase following diabetes is set
off by a pair of commas, indicating that it is
descriptive information that may be dropped
from the sentence; it is not a part of the subject.不太能理解。忘牛牛们帮助一下。另外，在SURPASSED前面加上and可以吗？

xingxc11

为何无大牛现身？我快要哭死了

ben8995

呵呵，就是说你可以把‘together with its serious complications’ 拿掉来考虑主谓一致啊。

jj449

这就是对“插入语”的英文解释~~
The phrase following diabetes is set
off by a pair of commas, indicating that it is
descriptive information that may be dropped
from the sentence; it is not a part of the subject.
什么是插入语？提供描述性信息，非主语的一部分，逗号间的内容可以去掉不用考虑！
因为它是插入语，所以不能在surpass前加and！and会是多余的！