真題一道

[Lory]

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 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

出自GWD+天山30回測驗 第6回之第2題
不太了解 請幫忙 為何係A而非E? , 請指點.

[freshmanduke]

這題之前有討論過了
你可以參考置頂帖 gwd & 天山匯總! ^^