一道不能解决的问题

Q16:

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.

A.   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

B.    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

C.   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

D.   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

E.    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(not only…but…也是正确的)
                

   Answer: B(E)(不是说最好不要改变原来的句子形式吗?原来是倒装句!)

正确答案是E

B和E最大的区别在于but also引导的分句中有没有it做分句的主语。

B中缺少了这个it，好像不妥。

既然其他答案全错，只有选E，虽然改变了原句的倒装结构，算是退而求其次吧。（我的理解）