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题库 / Prep2007E2-SC-80
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.
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
With children's programming having been limited at one time to a few hours a week, now at least four cable networks have dedicated themselves
Once limited to a few hours a week, there are now at least four cable networks with children's programming that dedicate themselves
Children's programming was once limited to a few hours a week, but now there are at least four cable networks dedicated
While children's programming had once been limited to a few hours a week, at least four cable networks are now dedicated
（A）wrong，2 reasons
1. Dedicate oneself to blablabla_>subject should be a person or a life.
Sth is dedicated to->right. Subject should be Thing, generallly.
2. Had+p.p. Wrong usage here.
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