关于杨鹏长难句里面句子的问题求助~帮帮忙哦~ 034 Only when a system possesses natural or artificial boundaries that associate the water within it with the hydrologic cycle may the entire system properly be termed hydrogeologic. 书上说这里的it 指的是boundaries……怎么是这样的??boundaries不是复数么?? 大神帮忙解答啦~~
only when a system possesses natural or artificial boundaries that associate the water within it with the hydrologic cycle, the entire system may be properly termed hydrogeologic.