the band U2 WAS just one of many new groups on the rock music scene in the early 1980s, but less than 10 years later, U2 HAD fully ECLIPSED its early rivals in the pantheon of popular music.
这是MGMAT里的句子, had eclipsed 的动作发生在was just one of new group 之后,为什么反而用过去完成时呢?求教~~