118. The world wildlife fund has declared that global warming, a phenomenon most scientsts agree to be caused by human begings in burning fossil fuels, will create havoc among migratory birds by altering the enviroment in ways harmful to their habitats.
a) A phenomenon most scientists agree to be caused by human beings in burning fossil fuels,
b) a phenomenon most scientists agree that is caused by fossil fuels burned by human beings,
c) a phenomenon that most scientists agree is caused by human beings's burning of fossil fuels
d) which most scientists agree on as phenomenon caused by human beings who burn fossil fuels,
e) which most scientsts agree to be a phenomenon caused by fossil fuels burned by human beings
答案是C
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其实这里的a phenomenon 指代global warming，从而不用再重复 global warming。
其实这里是同位语从句，不是定语从句。（名词 that 同位语从句）
感谢alienx，能不能麻烦具体点？要是能有inlined answer那就最好了。 麻烦你了
1. A&E， 我知道有点怪。 但我想知道到底哪里怪。“agree to do” longman里的意思全是sb agree to sth 或sb agree to do sth
i--请问，A＆Ｅ错的原因是不是因为A agree to be done（A同意被怎样怎样。。）在这里变成scientist同意被caused by, 而不是phenomenon被caused by -- 意思错误？
ii--另外，agree to be sth (YaoMing agreed to be a Rockets)， agree to be adj (agree to be quite)两中用法都存在对吧？
iii--而 sb agree sth to be true/caused by就不对了（agree本身也是不及物动词）， 对吗？
iv--令， 在longman里找到My sister won't agree to our mother going into a nursing home, 这个可以generalize成agree to sb doing sth（赞成某人做某事)么？
2. 关于C选项， 我不明白你的意思。 能不能具体点回复我的这两个问题？没听说有”限制性的插入短語“这么个语法结构啊？
根据排除法还是能选出C的，但是对于C的用法，我没找到书面上的理论解释。
agree的含义：
跟不定式：“同意做某事”
跟从句：同意....是事实，或应当如何
所以A的不定式"同意被做掉"那么就错了，E的"同意成为一个现象"，也错了。
故：
选项A， 假如把by human beings in burning fossil fuels改成by human beings' burning of fossil fuels， 会变成最好选项么?
选项E, 假如把by fossil fuels burned by human beings改成by human beings' burning fo fossil fuels, 会变成最好选项么？
两个都不会。
读这个句子的时候我也一直在most scientists agree究竟是插入语还是定语从句的观点里徘徊...
如果是插入语，可是我查不到这样的用法，all in all, there're no commas on both sides...
那就试试看定语从句能否解释得通：
C选项：a phenomenon that most scientists agree is caused by human beings's burning of fossil fuels
宾语从句后面的that绝对是能省的，特别这里most scientists agree前面有一个that了，句子里要避免两个that出现得很近，所以会省略一个或者把其中一个that用其他词替换.
所以我们在还原C选项的时候应该把that也补上：
a phenomenon that most scientists agree (that the phenomenon) is caused by human begins' burning of fossil fuels.
可以发现省略去后面的the phenomenon后：第一不引起歧义，因为phenomenon在宾语从句里做主语，离得也近，第二如果重复phenomenon会很罗嗦。所以省略the phenomenon并没有问题。只要符合这两点，语法里无一例外都能省略，我们或许应该把省略的范围看得再大一点，而不仅限于平行比较结构。
两位（alienx & aeoluseros）牛魔王（称呼NN太埋没您了），前边的问题不用再看了， 总结了一下：
1.“【aeoluseros】宾语从句后面的that绝对是能省的(尤其像这种定语从句里还带个宾语从句的)” -- 【paul】 这点能确定么？ 我是不是应该雇人把XDF石林给”做“了？--anyway，假如能省， aeoluseros的解释我可以接受 ^_^
2. “【aeoluseros】只要符合这两点，语法里无一例外都能省略，我们或许应该把省略的范围看得再大一点，而不仅限于平行比较结构。” --【paul】同意， ellipsis --还记得有一道OG， ”the wine has been priced to sell, and they do （sell）"这道题我正经痛苦了一阵，最后去了manhattan review 的forum才弄明白
3. "【alienx】中的most scientists agree是限制性的插入短語, 所以沒有commas. 如果有commas, 那就變成a phenomenon that is caused by human beings's burning of fossil fuels. 意思上不太一樣." 【paul】您解释解释什么叫（限制性）插入短语吧？我觉得插入语得用comma隔开啊.既然你说这是插入语， 那不是说句子"主干"就是"a phenomenon that is caused by ..."么？这次麻烦你一定elaborate。
恩，我确定能省。Prep里面也有很多例子，比如松鼠跳的那个：
135. At one time, the majestic American chestnut was so prevalent that it was said a squirrel could jump from tree to tree without once touching the ground between New York State and Georgia.
了解了。一般都是两个that在一起离得太近可以省一个对吧？
另， 这题确实也可以理解成插入语！其实殊途同归， 搞不好这两个其实是一个知识点，你觉得呢 （你上边PREP135“it was said"不也可以看成是插入语嘛）？
用简短的句子结构作插入语。这类短语有:I think, I hope, I guess, I believe, I suppose, I wonder, I tell you, I say, I'm afraid, I'm sure, you see, you know, as you know, that is, that is to say, what's more等等,它们可以置于句中或句尾。如:
I suggest you choose someone who you think is kind and friendly.
This diet, I think, will do good to your health.
It won't be raining long, I hope.
You will have to work harder, you know, if you want to succeed.
1.我觉得两个也没大差别
2.主+谓就两个词啦。再短也得两个^_^
谢谢两位版主！！
麻烦斑竹NN帮忙解释一下
B的a phenomennon most scientists agree that is caused by ...为什么不对呢？
如果按aeoluseros斑竹 说的a phenonmenon (that)most scientists agree 这里是省略定语从句的that，而把宾语从句的that留下可以嘛？
那如果按AlienX斑竹说的是插入语的话，为什么不能在前面做插入语呢？
OG里面对B的解释已经有了:That is should immediately follow phenomenon, not agree.
这句话里可以看出来：
1.同位语从句的that必须跟在概括词后面。
2."that is"是整体。
麻烦斑竹NN帮忙解释一下
B的a phenomennon most scientists agree that is caused by ...为什么不对呢？
如果按aeoluseros斑竹 说的a phenonmenon (that)most scientists agree 这里是省略定语从句的that，而把宾语从句的that留下可以嘛？
那如果按AlienX斑竹说的是插入语的话，为什么不能在前面做插入语呢？
插入语的位置总是很关键，它只从属于离它最近的分句，比如这里就肯定只从属于a phenonmenon that引导的同位语从句里。所以逻辑意思也有不同
谢谢斑竹~我明白这个了~在问一下关于定语从句的that什么时候可以省略，什么时候必须加?
OG50.in the economy to avoid the recession many were fearing earlier in the year, and rather to come 这里OG的解释是the recession must be followed by that.
而62. to establish tighter restrictions on the amount of grain farmers will be allowed to grow and to encourage这里的farmers前就没有加that
OG50.in the economy to avoid the recession many were fearing earlier in the year, and rather to come 这里OG的解释是the recession must be followed by that.
这句recession后面如果加了that，后面的是同位语从句，而不是定语从句。所以一定要加that。
定语从句的话，基本上如果句子清晰的话，只要先行词在从句中做宾语，就可以省。
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