大全678/987请教

1.        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）

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

为什么E比C好呢？实在是想不明白

多谢

B和C Programs 和 is 主谓不一致吧, A which 不地道，D they有歧义，so that E

我刚刚做了这道题，我觉得 C 的确没有单复数的问题，C 的问题是意思表达不好。原文是说这一类节目被禁止了，C 倾向于表达的是某种制作节目的方法被禁止了。

在C中没有找到as previous prohibitated，C中说的是as once prohibited。

个人认为as once prohibited语法上说的通，因为朗文字典里说once有三种词性，副词，名词和连词。作副词就可以讲得通。

如果是as previously prohibitated 好像也可以吧