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题库 / Prep2008E1-SC-197
Not only did the systematic clearing of forests in the United States create farmland (especially in the Northeast) and gave consumers relatively inexpensive houses and furniture, but it also caused erosion and very quickly deforested whole regions.
Not only did the systematic clearing of forests in the United States create farmland (especially in the Northeast) and gave consumers relatively inexpensive houses and furniture, but it also
Not only did the systematic clearing of forests in the United States create farmland (especially in the Northeast), which gave consumers relatively inexpensive houses and furniture, but also
The systematic clearing of forests in the United States, creating farmland (especially in the Northeast) and giving consumers relatively inexpensive houses and furniture, but also
The systematic clearing of forests in the United States created farmland (especially in the Northeast) and gave consumers relatively inexpensive houses and furniture, but it also
The systematic clearing of forests in the United States not only created farmland (especially in the Northeast), giving consumers relatively inexpensive houses and furniture, but it
题目分析：
本题主要考查了not only和but also以及单独的but also的语意区别。
选项分析：
A选项：not only位于句首时，其引导的句子需要用倒装，give和create是由并列连词and连接的两个并列成分，而由于时态已经被did提前，因此只能用原形，即，gave需改为give。另外，not only…but also…表示其连接的两者是递进关系，也就是说其连接的两件事应该是同方向的。在本题中，提供便宜的家具是好事，但是使得森林沙漠化则是坏事。因此，这两件事应该是转折关系而不是递进关系。
B选项：非限定性定语从句 which gave consumers relatively inexpensive houses and furniture应就近修饰名词farmland。显然地，给消费者便宜的家具的应该是“系统化的砍伐森林”，而不是“农场”。另外，连词 not only…but also…错误同选项(A)。
C选项：本选项具有语法错误，but是连词，其需要连接两个句子。但本选项中but身前缺少谓语动词。
D选项：Correct. 本选项在语法和逻辑上均是正确的。
E选项：连词 not only…but also…错误同选项(A)。
D中的but also不也表示递进吗？
我觉得是转折关系
你不能看见but 后面出现个also就是递进关系，not only...but also句型，和D选项的but作为连词连接连个独立句子，表转折的关系是两回事儿
你的意思是不是这里的also可以省略？
我觉得其实可以省，不加also的话整个句子转折意味更强；只是不省的话，代表作者未完全否定systematic clearing of forests带来的好处，只是用“但是也”提到了一下systematic clearing of forests的副作用。
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