Although all the proceedings of the Communist party conference held in Moscow were not carried live,Soviet audiences have seen a great deal of coverage. (A) all the proceedings of the Communist party conference held in Moscow were not carried live (B) all the Communist party conference's Moscow proceedings were not carried live (C) all the Communist party conference Moscow proceedings have not been carried alive (D) not all the Communist party conference Moscow proceedings have been carried alive (E) not all the proceedings of the Communist party conference held in Moscow were carried live 有哪位大神解释一下D和E中时态的问题吗?为什么不能用现在完成时
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