题目

He insisted that he should go with us. →He insisted _________ with us. A . to go B . on going C . to going D . on go 答案：BX、Y两种元素的原子的质子数之和为20，两元素形成的化合物在水溶液中能电离出电子层结构相同的阴阳离子，则X、Y形成的化合物是                                              （    ）       A．MgF：z           B．NaF                 C．LiCl                 D．Na2O