求助gwd-10-3

whygodnotear

For protection from thesummer 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

答案选A，想不通，我选了E，题目意思都不太明白，请各位大侠帮忙看看

ring_cheng

这里用的是独立主格：each+名词+过去分词

E是不对的，简略后为: with +名词, 独立主格中没有这种用法

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xiaoqing508