not only did the systematic clearing of forests in the US 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. A. Not only did the systematic clearing of forests in the US create farmland(especially in the Northeast) and gave consumers relatively inexpensive houses and furniture, but it also B. Not only did the systematic clearing of forests in the US create farmland(especially in the Northeast), which gave consumers relatively inexpensive houses and furniture, but also C. the systematic clearing of forests in the US, creating farmland(especially in the Northeast) and giving consumers relatively inexpensive houses and furniture, but also D. the systematic clearing of forests in the US created farmland(especially in the Northeast) and gave consumers relatively inexpensive houses and furniture, but it also E. the systematic clearing of forests in the US not only created farmland(especially in the Northeast), giving consumers relatively inexpensive houses and furniture, but it
答案为什么是B呢。。 我觉得这里的not only, but also的用法很奇怪啊。。主语不应该在not only 前面吗?