问个语法题
Competition in the mid-nineteenth century by large western farms gradually caused farmers in Pennsylvania to turn to livestock raising, but before that it was predominantly grain-producing.A. Competition in the mid-nineteenth century by large western farms gradually caused farmers in Pennsylvania to turn to livestock raising, but before that it was predominantly grain-producing.
B. Once predominantly a grain-producing state, competition in the mid-nineteenth century from large western farms gradually was causing Pennsylvania’s farmers to turn to livestock raising.
C. Pennsylvania’s farmers were gradually caused to turn to livestock raising by competition from large western farms in the mid-nineteenth century, but before that it was predominantly a grain-producing state.
D. It was once predominantly grain-producing, but competition in the mid-nineteenth century by large western farms was gradually causing Pennsylvania’s farmers to turn to livestock raising.
E. Pennsylvania was once a predominantly grain-producing state, but competition in the mid-nineteenth century from large western farms gradually caused the state’s farmers to turn to livestock raising. 是选E吗？
回复 #2 real_arsen_ac 的帖子
对！忘打答案了怎么做的呢？特别是有没有什么很快的方法？：） 我觉得A和C中的IT指代不明，不能选，然后B和D中的was causing与原句时态不符，不能学，所以只有E了
回复 #4 joyce210210 的帖子
嗯，谢谢！时态是个让我很头痛的东西，有时候就是按照原句的时态来，有时候又要根据逻辑判断换一个时态。很头痛
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