When I was at the grocery store,I realized that the prices o

When I was at the grocery store,I realized that the prices of many items had been risen.
这是改错题,答案是将had been risen改为had been rising.我怎么觉得应该改为had risen呢?因为这里是when,为什么要用过去完成进行时,翻译不通啊,我觉得过去式就可以啊,当我在杂货店里,我意识到,很多标签上的价格都涨了.