我就问一个很小的问题，GWD11-14

小女公子

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

4. was banked with dirt as high as
   
5. was banked with dirt as high as that of

在这里能否通过run-on排除DE？若能，我就支持A，若不能，义无反顾指向D……

我豁出去了……

Avantasia

应该不可以吧，有and，也有逗号，为什么Run-on？