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.E
(A) each a roof of poles and arrowwood
(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（A）
(E) with roofs of poles and arrowweed that are
请NN们指点，A到底是个什么结构，为什么在这里是对的！谢谢
前面强调整体,后一句强调个体.是独立主格
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