308. 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 答案A,但是这个独立主格修饰的是shades,是M居住的房子,逻辑上怎么是roof呢?感觉上似乎应该是用with更好,但CDE当中每个也都有问题。
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