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

不知道此题讨论过没有啊？好像争议挺大的，不知从哪一个了...

求解答啊~谢谢诶

这个题参考答案是B，好像GWD本人说答案应为A。

我也比较倾向A，

我认为B中which指代好像不明确（指代主语太远）或者不正确（指代句子）。。。

(a) has a verb tense problem: "create... and gave..." are not parallel, yet they should be. i.e., the sentence should read "create...and give...".

To be honest, I'm not a huge fan of (b) either. For the sentence to be truly parallel, there should be an "it" after the comma, but comparatively speaking, it's okay in this sentance