Although at one time children's programming had been limited to a few hours a week, now, however, there are at least four cable networks that dedicate themselves entirely to shows produced specifically for children.
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AAlthough at one time children's programming had been limited to a few hours a week, now, however, there are at least four cable networks that dedicate themselves
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BWith children's programming having been limited at one time to a few hours a week, now at least four cable networks have dedicated themselves
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COnce limited to a few hours a week, there are now at least four cable networks with children's programming that dedicate themselves
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DChildren's programming was once limited to a few hours a week, but now there are at least four cable networks dedicated
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EWhile children's programming had once been limited to a few hours a week, at least four cable networks are now dedicated
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正确答案: D