[求助]987-987

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

1、请教为何achieving, achievement 作为名词 不是更好么？

2、think of ... as 是固定搭配，怎么think to be 也是么？

3、答案C中that 的先行词是哪个？consistency ? 根据后面的定从was 可以判断。但难道没有歧义？因为可指quality and production

985.Those who have visited the Grand Canyon have typically seen layers of sediment in the gaping canyon, with different colors that mark the passage of time like the rings in a tree trunk.

(A) seen layers of sediment in the gaping canyon, with different colors that mark

(B) see layers of sediment in the gaping canyon, whose different colors mark

(C) been seeing layers of sediment in the gaping canyon, whose different colors are markers of

(D) been able to see layers of sediment in the gaping canyon, with different colors marking（D）

(E) seen layers of sediment in the gaping canyon, marking by different colors

1.with 的用法，我只知道with有跳跃修饰，但好多题用with的时候说有歧义，请指教

up