请帮我解释一下这道题。谢谢。

txsnowsea · 发表于 2011-1-3 11:50:13

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.

each a roof of poles and arrowweed
each a roof of poles and arrowweed that are being
with each being a roof of poles and arrowweed
with roofs of poles and arrowweed to be
with roofs of poles and arrowweed that are
选A

wudiyeah · 发表于 2011-1-3 14:31:51

each型独立主格，指代其前复数名词

本贴相关题目 TN-08-SC-3 (MYSD)

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请帮我解释一下这道题。谢谢。

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