真题14及think 的用法

14.   With cloning technology, scientists are approaching what has long been the ultimate goal of modern husbandry: achieving a consistency of quality and production in farm animals as once thought to be limited to manufactured goods.

(A) achieving a consistency of quality and production in farm animals as once thought to be

(B) achieving farm animals with a consistency of quality and production as were once thought of as

(C) achieving in farm animals a consistency of quality and production that was once thought to be

(D) achievement of farm animals whose consistency of quality and production are the same as what were once thought to he（C）

(E) achievement of farm animals at a consistency of quality and production once thought of as

think of sth as 是固定用法， think of sth to be 记得以前出现过都是错的，想确认一下，谢谢