[求助]急问GWD11-Q14答案，请帮忙，谢谢

lori

Q14:

The single-family house constructed by the Yana, a Native American people who lived in what is now northern California, was conical in shape, its framework of poles overlaid with slabs of bark, either cedar or pine, and banked with dirt to a height of three to four feet.

A.    banked with dirt to a height of

B.     banked with dirt as high as that of

C.    banked them with dirt to a height of

was banked with dirt as high as

was banked with dirt as high as that of

急问答案与原因，谢谢

yangsh

a

lori

能简单解释一下原因吗？E为什么不对？

yizhoujiang

visit this site:

http://forum.chasedream.com/dispbbs.asp?boardid=23&star=4&replyid=611625&id=56350&skin=0&page=1