50. As a baby emerges from the darkness of the womb with a rudimentary sense of vision, it would be rated about 20/500. or legally blind if it were an adult with such vision.

(A) As a baby emerges from the darkness of the womb with a rudimentary sense of vision, it would be rated about 20/500, or legally blind if it were an adult with such vision.

(B) A baby emerges from the darkness of the womb with a rudimentary sense of vision that would be rated about 20/500, or legally blind as an adult

(C) As a baby emerges from the darkness of the womb, its rudimentary sense of vision would be rated about 20/500; qualifying it to be legally blind if an adult

(D) A baby emerges from the darkness of the womb with a rudimentary sense of vision that would be rated about 20/500; an adult with such vision would be deemed legally blind.

(E) As a baby emerges from the darkness of the womb, its rudimentary sense of vision, which would deemed legally blind for an adult, would be rated about 20/500.

这里A ,C,E选项中的AS的用法正确么，OG解释中并未提到这一点

个人感觉是不太对的

另外 WOULD BE RATED ABOUT 为什么要用虚拟语气呢

RATED ABOUT 20/500 是习语么

thks

1. "这里A ,C,E选项中的AS的用法正确么，OG解释中并未提到这一点"
这里用as正确呀，大大地正确。as在这儿是“随着。。。”的意思。表示主句和由as引导的从句在时间上的一致。

2. "另外 WOULD BE RATED ABOUT 为什么要用虚拟语气呢"
表示不可能的事或当前的事的一种假设。

3. "RATED ABOUT 20/500 是习语么"
不是。

题干的主语是初生baby的视觉能力

about只是用来表示程度的大概

一点拙见