Q3: 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 ( Answer is A, each a 不语意重复吗？）
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。
each的这种用法好像也是ETS prefer的。
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