***************** entirely to shows
produced specifically for children.
(A) 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
(B) 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
(C) Once limited to a few hours a week, there are now at least four cable networks with children's
programming that dedicate themselves
(D) Children's programming was once limited to a few hours a week, but now there are at least four
cable networks dedicated
(E) While children's programming had once been limited to a few hours a week, at least four cable
networks are now dedicated
这道题E为什么不对请问 ？作者: JoshwuS 时间: 2011-7-7 22:02
had been是过去完成时，只有在有明显的过去时动词出现时才会用到过去完成时作者: zhouyeying 时间: 2011-7-8 21:38
