GWD10关于独立主格和with的用法讨论

六月的水蜜桃

GWD-10-Q3

Forprotection from the summer sun, the Mojave lived in open-sided, flat-toppeddwellings known as shades, each a roof of poles and arrow weed supportedby posts set in a rectangle.

A.   each a roof of poles and arrowweed

B.   each a roof of poles and arrowweed that arebeing

C.   with each being a roof of poles andarrowweed

D.   with roofs of poles and arrowweed to be

E.    with roofs of poles and arrowweed that are

答案是A，是用独立主格。可是E为什么不对呢？感觉也很通顺呀

heidiym

个人拙见，我看了下我的笔记，讲到with的用法。摘录如下
Now let’s talk about the comma + with modifiers. So here we are talking about prepositional phrases. “with” modifiers are very versatile modifiers. They can modify either the preceding clause or the preceding nouns. What they modify actually depends on the context of the sentence and the wording of the modifier itself.

我认为划线句主要是修饰shades的，但用了with之后有修饰整句话，好像伴随或者添加的意味在里面，而不是专门单独修饰解释shades的。求NN解答，具体我也不是很清楚。我总感觉with有种伴随、同时的感觉吧。