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.
Television programs developed in conjunction with the marketing of toys, which was once prohibited by federal regulations, are
Television programs developed in conjunction with the marketing of toys, a practice that federal regulations once prohibited, is
Developing television programs in conjunction with the marketing of toys, as once prohibited by federal regulations, is
Federal regulations once prohibited developing television programs in conjunction with the marketing of toys, but they are
Federal regulations once prohibited developing television programs in conjunction with the marketing of toys, but such programs are
B 选项主语是“Television programs”,后面的is主谓一致错误。C选项:Developing TV programs is thriving意思错了,而且As引导的状语从句缺少主语
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