天山7-Q2:

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

答案是A，为什么E不对。

前面的复数名词，后面用each ＋单数名词，这个是固定的用法，Ｇ的偏好

Ｅ的 that are 多余了吧！～嘿嘿