题目信息
For protection from the summer sun, the Mojave lived in open-sided, flat-topped dwellings known as shades, each a roof of poles and arrowweed supported by posts set in a rectangle.
A:each a roof of poles and arrowweed
B:each a roof of poles and arrowweed that are being
C:with each being a roof of poles and arrowweed
D:with roofs of poles and arrowweed to be
E:with roofs of poles and arrowweed that are
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已选答案：
正确答案：
A:each a roof of poles and arrowweed
A 正确，each引导的强调型独立主格结构，强调句未的复数名词，形式为：句子+复数名词结尾，each+介词短语/形容词短语/名词短语/-ing形式/-ed形式。
B being风险结构，排除。
C being风险结构，排除。
D roofs与a rectangle不匹配
E roofs和arrowweed后面的that are从句有歧义，不明确修饰对象，且roofs与a rectangle不匹配
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题目来源
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