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
答案E，其中出现prohibit doing用法，不是只有prohibit sth 和prohibit sb from doing么？prohibit doing 是否对？ | 
