糾結好久的一題GWD SC,麻請牛人解答

 這題糾結好久,想破頭了,一直想選D, 想請牛人解答一下,萬分感激

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

感謝你,got it!果然我題目練得不夠多,分析也不夠仔細,繼續苦讀

祝你申請順利唷!謝謝