最新题13套中的一个问题

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

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.

was conical 和was banked 并列，两者主语都是the house,所以选D

It can be argued that "banked" is used in parallel with "overlaid", and "either cedar or pine" is a parenthesis.  This parallel structure is well reasoned and well balanced by the "with" prepositional phrases.