Gwd11-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

was banked with dirt as high as that of

the answer should be A or D

A seems little uncomfortable with “ to a height of”

But the “was “ is D should be omitted.

Open to discussion!

我觉得是A，独立主格

its framework of poles overlaid with ........ and banked

我本来选的是D，不过，仔细看了后，觉得A更正确。

to a height of 的用法我见过。不过一时半会找不到例子了。