PREP 61 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.
A. it appears was an ancient lakeshore hunting ground as stunning evidence of human ancestors who
B. it appears had been an ancient lakeshore hunting ground and stunning evidence that human ancestors
C. appears was an ancient lakeshore hunting ground and is stunning evidence that human ancestors
D. appears to be an ancient lakeshore hunting ground, stunning evidence that human ancestors
E. appears that it is an ancient lakeshore hunting ground, stunning evidence of human ancestors who
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.
×prep关于错误原因是这样解释的：因为what从句中出现what和it两个主语，以及appears和was两个谓语，句子结构错误
PREP 101. The electronics company has unveiled what it claims to be the world’s smallest network digital camcorder, the length of which is that of a handheld computer, and it weighs less than 11 ounces.
A. to be the world’s smallest network digital camcorder, the length of which is that of a handheld computer, and it weighs
B. to be the smallest network digital camcorder in the world, which is as long as a handheld computer, weighing
C. is the smallest network digital camcorder in the world, which is as long as a handheld computer, and it weighs
D. is the world’s smallest network digital camcorder, which is as long as a handheld computer and weighs
E. is the world’s smallest network digital camcorder, the length of which is that of a handheld computer, weighing
The electronics company has unveiled what it claims is the world’s smallest network digital camcorder, which is as long as a handheld computer and weighs less than 11 ounces.√ 为什么同样的结构这里就是对的呢？麻烦NN指点一下，谢谢！
第一题关键是appear to 固定搭配，第二个是一个以what it claims引导的主语，接谓语is和weighs.即what it claims...is,what it claims...weighs
谢谢楼上热心的回答，不过应该是绿色部分平行才对…camcorder, which is as long as a handheld computer and weighs less than 11 ounces. 呵呵
谢谢楼上的，我对平行没有疑问啦，是需要“Prep 61和prep 101为什么相同的结构一个算错一个算对呢？”的一个更好的解释！
The electronics company has unveiled what it claims is the world’s smallest network digital camcorder, which is as long as a handheld computer and weighs less than 11 ounces.√ 说明黄色部分是对的。可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.
× prep却说绿色部分结构是错的！为什么呢？
AlienX解释得精辟~~顶一个~
既然在说what从句，我还有一个问题，关于什么时候使用what从句。
17.The success of the program to eradicate smallpox has stimulated experts to pursue what they had not previously considered possible--better control, if not eradication, of the other infections such as measles and yaws.
(A) what they had not previously considered possible--better control, if not eradication, of the other infections such as
(B) what they had not previously considered a possibility--better control, if not eradication, of such infections like
(C) something they had not previously considered possible-better control, if not eradication, of such infections as
(D) something not considered a previous possibility--better control and perhaps eradication, of other infections such as
(E) the possibility of what they had not previously considered--better control and possibly eradication of infections like
如果C中something改成what，这个句子有没有什么问题呢？什么情况下使用what从句呢？
我觉得what和something互换没有错误 因为都没有具体说出来是什么东西
61题中错在it没有指代 不认为是插入语 在这里what是企图做appears的宾语的 what it appears作为主语从句做主语A 然后A SVO
101题改为unveiled what is claimed to be也不对 相当与是claimed what to be sth. 因为Longman中说道claim的用法是 claim that(即直接加宾语) claim to be但是绝对没有claim sth. to be sth. 所以错
就算是改成what claimes to be the smallest C也不对 因为what语义上是the smallest C它自己是不能发出claim这个动作的
claim to do/be something
No responsible therapist will claim to cure your insomnia.I don't claim to be a feminist, but I'd like to see more women in managerial posts.
claim to have done something
Two young girls claim to have seen the fairies.
The electronics company has unveiled what it claims is the world’s smallest network digital camcorder, which is as long as a handheld computer and weighs less than 11 ounces.
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.
还有一个问题，第一个句子it指代company没错，what在主句和从句中都作宾语，unveiled what 和what it claims is
第二个句子，it明显没有指代对象么，我我觉得这个what从句和前面一个性质上有点不一样，这个what有指代对象，就是指代wooden spears ，再有it就重复了
Researchers in Germany have unearthed 400,000-year-old wooden spears from what appears to be an ancient lakeshore hunting ground, stunning evidence that human ancestors
我觉得what it claim is the world's…… ounces，这个句子是主语从句。what 在从句中应该是主语，what指代camcorder，变成camcorder is the world's smallest network digital camcorder.
我觉得what it claim is the world's…… ounces，这个句子是主语从句。what 在从句中应该是主语，what指代camcorder，变成camcorder is the world's smallest network digital camcorder.
同意！我也认为这是主语从句。
1. 在unveiled what it claims is结构中， what 既做了前面unveiled 的宾语
又做了后面句子的主语：it claims that what is the world's .....
或者也可以把it claims当做插入语来看。大家熟悉的do you think, sb. think也有类似用法。Do whatever you think is right.
2. 在unveiled what it claims to be the ....结构中，what 做了it claims的宾语，也是正确的结构。有一个题好像是：animals that human beings are known to have forced to extinction. animals 在定语从句中作宾语，和这里的what 在定语从句中做宾语一样。
这个题光凭这两个结构的不同，不能排除。考察点应该是在后面的比较上，要合理。
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