大全678一个干扰项的仔细分析请教

 678.     Television programs developed in conjunction with the marketing of toys, which was once prohibited by federal regulations, are thriving in the free market conditions permitted by the current Federal Communications Commission.

(A) Television programs developed in conjunction with the marketing of toys, which was once prohibited by federal regulations, are

(B) Television programs developed in conjunction with the marketing of toys, a practice that federal regulations once prohibited, is

(C) Developing television programs in conjunction with the marketing of toys, as once prohibited by federal regulations, is

(D) Federal regulations once prohibited developing television programs in conjunction with the marketing of toys, but they are

(E) Federal regulations once prohibited developing television programs in conjunction with the marketing of toys, but such programs are

答案是E没有问题，谁能仔细分析一下C为什么不对？Developing这个现在分词和后面的is thriving逻辑上能说通嘛？另外，as once prohibited by …这个结构对不对？谢谢

不能用动名词Developing, 因为Develop本身就有名词形式Development, 即使要用也要用develpment of xx programs

查了下大全, 好像在987题又出现as once , 但也是把as once换成了once

602.                        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

我觉得C选项改变了句意;主语变成 Developing而非program,本来强调的是program的流行,现在变成develop 这种program变的流行,感觉强调的重点不同