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Beyond GMAT
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The single-family house constructed by the Yana, a Native American people who lived in what is now northern California, was conical in shape, its framework of poles overlaid with slabs of bark, either cedar or pine, and banked with dirt to a height of three to four feet.
A. banked with dirt to a height of
B. banked with dirt as high as that of
C. banked them with dirt to a height of
D. was banked with dirt as high as
E. was banked with dirt as high as that of整个句子的结构其实是蛮清楚地，
（The single-family house）这个是主语 （constructed by the Yana, a Native American people who lived in what is now northern California）这个修饰主语的定语，其中a Native American people作为 Yana的同位语, （was conical in shape）这个完整的谓语部分,（ its framework of poles overlaid with slabs of bark, either cedar or pine, and banked with dirt to a height of three to four feet.）这个是一个 n. + 过去分词 的独立主格结构 其中either cedar or pine是插入语。
所以A选项本身是没有明显语法和逻辑上的错误的，它也正确地表达了句子的意思
B选项的错误是明显的 that没有明确的指代
C选项的错误bank后面加了them 这样bank就变成了谓语 而不是之前的过去分词，那么考察and之前 能与谓词并列的只能是was 所以就变成了house bank them with ...
这和句子的意思是不合的，因为句子的意思是这个屋子的框架被banked with dirt
D和E选项除了that (E选项里面的)没有明确指代之外，都有一个共同点 就是使用了was 这使得banked的承受者从framework变成了singal-family house，这个和句子的逻辑意思是不合的，另一个问题是如果这里出现了was，那么就造成its framework结构成为了一个位于句中的独立主格，这在official written English里面是非常少见的，独立主格同场只存在于句首和句末
A其实是正确答案
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