请教一题。。。NN们进来

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.

1. each a roof of poles and arrowweed
2. each a roof of poles and arrowweed that are being
3. with each being a roof of poles and arrowweed
4. with roofs of poles and arrowweed to be
5. with roofs of poles and arrowweed that are

   Answer: A

非牛

后面的独立主格，做伴随状语

with 在句末修饰，一般都是跟独立主格

做伴随状语

DE错在这里

BC being 错的, 而且wordy

我是个目标500分的人，我觉得可以通过平行结构，因为所有选项里都有and

不知道对不？