OG13 SC97 的平行问题

waihou32

97. Some anthropologists believe that the genetic homogeneity evident in the world's people is the result of a "population bottleneck"—at some time in the past our ancestors suffered an event, greatly reducing their numbers and thus our genetic variation.
(A) at some time in the past our ancestors suffered an event, greatly reducing their numbers
(B) that at some time in the past our ancestors suffered an event that greatly reduced their numbers
(C) that some time in the past our ancestors suffered an event so that their numbers were greatly reduced,
(D) some time in the past our ancestors suffered an event from which their numbers were greatly reduced
(E) some time in the past, that our ancestors suffered an event so as to reduce their numbers greatly,

D 选项的解释是：……The modifier of event is expressed with a wordy passive construction, which destroys the parallelism between it and what follows.

想请问的是：正确选项B的……an event that greatly reduced their numbers 和后面的非划线部分 and thus our genetic variation 又是怎么保持平行的呢？看不粗来……
恳请各位NN赐教！

bensealet

greatly reduced their numbers and our genetic variation

A and B 的平行

bensealet

D选项不对是因为 the numbers were greatly reduced and thus genetic variation
这种表达，and 后面直接加名词和前面的句子不对应

waihou32

哦~~~是既reduced了their numbers 又reduced了genetic variation 是吧~~
两个名词的平行~~
我蠢了……
谢谢哈~~

saffsa761

这道题我想问E选项 除了so as to会有语义错误之外，结尾的reduce their numbers greatly，and thus our genetic variation有没有错？我记得好像逗号加and后面必须是完整的句子吧？ 如果是名词并列的话，不需要最后一个逗号：A,B and C就可以吧？

ivoryli

agree