题目

In his victory speech ______ before a huge crowd of his supporters, Obama declared that “change has come to America.”A．having delivered     B．to be delivered  C．delivering         D．delivered 答案：D 细胞有丝分裂最重要的特征是(     ) A．有纺锤体出现      B．有染色体复制和染色体的平均分配 C．有染色体出现      D．有核膜、核仁的消失