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Researchers in Germany have unearthed 400,000-year-old wooden spears from what it appears was an ancient lakeshore hunting ground as stunning evidence of human ancestors who systematically hunted big game much earlier than believed.

1. it appears was an ancient lakeshore hunting ground as stunning evidence of human ancestors who

2. it appears had been an ancient lakeshore hunting ground and stunning evidence that human ancestors

3. appears was an ancient lakeshore hunting ground and is stunning evidence that human ancestors

4. appears to be an ancient lakeshore hunting ground, stunning evidence that human ancestors

5. appears that it is an ancient lakeshore hunting ground, stunning evidence of human ancestors who

我想问it appears 和 appears to be都没有错啊？

我也很想知道这个句子的结构是什么,有哪位指点一下吗?

The structure for this sentence is

"Researchers have unearthed spears from an ancient hunting ground." so that's why it is correct to use "what appears to be"

Also the "evidence + that" to explain the what kind of evidence it is.  

我认为A和B还有E中的it 没有指代对象

然后Researchers in Germany have unearthed 400,000-year-old wooden spears from what appears to be an ancient lakeshore hunting ground是stunning evidience的同位语

from what:指wooden spears被发现的地方。

整句话的意思是：德国研究人员某地发现了一个400，000前的木枪，该地方貌似是个古代的湖边狩猎场。这个发现证明了人类祖先开始系统狩猎的时间比普遍认为的时间要早。

A, it 与 what意思重复； as 错

B，it 与 what意思重复。and stunning 错。用平行逻辑错，且平行前后时态不一致。

C,appears 与 was意思重复

D,正确  stunning evidence that human ancestors名词evidence+同位语从句，用来解释说明整个主句

好像叫做概括性同位结构。<explanation from http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=349329&replyID=3120317&skin=1>

E, appears  that it is 太罗唆了。stunning evidence of human ancestors 做人类祖先的极好证据 意思讲不通

好像叫做概括性同位结构。<explanation from http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=349329&replyID=3120317&skin=1>

E, appears  that it is 太罗唆了。stunning evidence of human ancestors 做人类祖先的极好证据 意思讲不通