一道牵涉到时态的英语竞赛题.求助大神解释~~It was only after some progress ____ in the use and development of electric current that men began to realize the importance and possibilities of magnetism.A.was made

一道牵涉到时态的英语竞赛题.求助大神解释~~It was only after some progress ____ in the use and development of electric current that men began to realize the importance and possibilities of magnetism.A.was made 求助大神 工程制图的一道题如图3-9题 一道关于三角函数的题目,求助各位大神^_^ ​求助大神成语233里的一道题目! 初中圆的竞赛题一道, 问一道高中化学的竞赛题 一道波兰竞赛题的解答 笑牵涉到牙的动态成语牙:笑牵涉到牙的动态:笑不露齿 _______ _______ 求助一道英语题目 求助关于高中地理经纬网的一道练习求详细解释 一道高数竞赛题求解求大神给个过程 求助英语 大神来解答 求助英语一窍不通求大神 用现有的工具测量地球到太阳的直线距离这是一道物理竞赛题 求助数学大神,一道排列题 求助一位英语好的大神,翻译一篇英文材料 译成英语...……in fact they were concerned simply with making profits from the culture treasures.这句的be concerned with 是“牵涉到”么? lonlywishlwasyouronly求助懂英语的朋友解释这句英语,