请问补充250题82题语法结构

82.   Many of them chiseled from solid rock centuries ago, the mountainous regions of northern Ethiopia are dotted with hundreds of monasteries.

(A) Many of them chiseled from solid rock centuries ago, the mountainous regions of northern Ethiopia are dotted with hundreds of monasteries.

(B) Chiseled from solid rock centuries ago, the mountainous regions of northern Ethiopia are dotted with many hundreds of monasteries.

(C) Hundreds of monasteries, many of them chiseled from solid rock centuries ago, are dotting the mountainous regions of northern Ethiopia.

(D) The mountainous regions of northern Ethiopia are dotted with hundreds of monasteries, many of which are chiseled from solid rock centuries ago.

(E) The mountainous regions of northern Ethiopia are dotted with hundreds of monasteries, many of them chiseled from solid rock centuries ago.

Key is E. 想问问E中many of them chiseled from solid rock centuries ago.是什么语法结构？是过去分词的独立主格？

谢谢!

感谢斑竹，我查过以前的帖子，但是仿佛都没有讲 many of them chiseled from solid rock centuries ago.是什么语法结构，也许因为太简单的原因吧。不好意思。

望再指教。tks

棒极了我怎么就没去想呢只是在想不就位置换了一下吗？

太谢谢你了这么快就回复。