OG-12--6 和21--仍然在纠结，请NN指教

vvccyy

6.   In late 1997, the chambers inside the pyramid of the Pharaoh Menkaure at Giza were closed to visitors for cleaning and repair due to moisture exhaled by tourists, which raised its humidity to such levels so that salt from the stone was crystallizing and fungus was growing on the walls.
(A)    due to moisture exhaled by tourists, which raised its humidity to such levels so that salt from the stone was crystallizing
(B)    due to moisture that tourists had exhaled, thereby raising its humidity to such levels that salt from the stone would crystallize
(C)    because tourists were exhaling moisture, which had raised the humidity within them to levels such that salt from the stone would crystallize
(D)    because of moisture that was exhaled by tourists raising the humidity within them to levels so high as to make the salt from the stone crystallize
(E)    because moisture exhaled by tourists had raised the humidity within them to such levels that salt from the stone was crystallizing
OG的解释C,D,E:
C The pronoun them seems to refer to tourists, which is nonsensical; the entire construction is awkward and wordy; would crystallize is not parallel to was growing.
D Once again, them seems to refer to tourists; the entire construction is awkward, wordy, and ambiguous; crystallize is not parallel to was growing.
E Correct. The causal sequence is clear, and them clearly refers to chambers.
我一直都没有弄懂，为嘛D里的them有指代歧义，但是E里的就没有了，这到底是为什么。。。。

21.Neuroscientists, having amassed a wealth ofknowledge over the past twenty years about the brainand its development from birth to adulthood, are nowdrawing solid conclusions about how the human brain grows and how babies acquire language.

(A)Neuroscientists, having amassed a wealth ofknowledge over the past twenty years aboutthebrain and its development from birth toadulthood, are

(B)Neuroscientists, having amassed a wealth ofknowledge about the brain and its developmentfrom birth to adulthood over the past twentyyears, and are

(C)Neuroscientists amassing a wealth of knowledge about the brain and its development from birthto adulthood over the past twenty years, and are

(D)Neuroscientists have amassed a wealth ofknowledge over the past twenty years about thebrain and its development from birth to adulthood,

(E)Neuroscientists have amassed, over the pasttwenty years, a wealth of knowledge about thebrain and its development from birth to adulthood
OG解释：
A Correct. The explanatory phrase betweenthe subject and predicate is set off bycommas, and the mainclause contains botha subject (Neuroscientists) and acorresponding verb (are now drawing).

B And are indicates that are follows a previousverb, but in fact the sentence has not yetprovided a first main verb for the subjectNeuroscientists; the sentence is thereforeincomplete; over the ... years appears to be modifying adulthood.

C Amassing, like having amassed, functions asan adjective, not a verb; the sentencetherefore lacks thefirst main verb impliedby the compound verb construction and arenow drawing....

D The final descriptor in present tense, nowdrawing conclusions ... does not fit theopening clause, which is in present-perfecttense (have amassed a wealth ...) and seemsto modify adulthood.

E Like D, this sentence attempts to attach apresent-tense descriptor to a present-perfectclause.

不明白D、E是什么意思？是说句子是现在完成时，故这里用---ing的形式是错的吗？但是这里启的是分词的作用啊，迷惑。。。

vvccyy

自己顶下，没有人解答吗。。。

amy虫子

第6题，我也很困惑，DE的区别是什么。。。。。

21。
now drawing solid conclusions 在句末有两种作用，一是做为结果状语，修饰整句话（这里显然不对）；二是做伴随，修饰主语，这里Neuroscientists 的宾语是have assassed, 和drawing 这个动作不可能是伴随关系

Inflation

楼主问的问题有水平 俺也不知道
其实楼主需要这么纠结吗···
我选的话 第一题C平行不对 直接排除
              第二题跳过中间的插入语，直接找主谓AGREEMENT。选A  我觉得D,E都改变了句子的原本的结构和意思了 本来是插入语的部分反而成了主句 而主句反而成了可有可无的分词修饰了····

JuggernautZNJ

D不是从句，代词就近修饰；E中是从句，代词优先指代主句主语核心词，然后宾语核心词，再从句。。。

啊先生

我来说说

第一个说实话，我不太解释的清楚，我感觉LS的仁兄有道理，直接平行啊~
第二个好说，首先我们先要看谁能发出 now draw solid conclusion 这个动作，必然是.Neuroscientists啊！！！ 所以 这个动词一定通过一个系动词和主语.Neuroscientists练习在一起！！！ 另外，OG的解释很好，就是说DE的句子中draw conclusion的是adulthood，这个显然不对啊

ansonyulin

楼主，我又看到你的问题了。仅发表一下自己的意见，纯做各位参考。

题6，我觉得楼主的疑问在于对D选项句子结构的了解。
because of +moisture+that，很明显这是一个限定性定语从句，that后部分均为修饰moisture的。而再细看后面部分，你会发觉主干是moisture was exhaled by tourists，然后tourists 后面的又都是修饰tourists的。理解一下句意，你就会发现them是修饰tourists的而不是moisture的了。

至于题21，我觉得会比较好理解一点。
首先有一个问题在于，选项D/E都将原句进行了改写：将原来只是扮演从句修饰成分的having amessed...改为句子的主要成分了。而原句的主要成分，从句子后面未划线部分可发现，是一个现在进行时态的结构。若如D/E般修改，前面完成时后面进行时，这种时态的混淆也是错的。我想这也是解释里提及的意思。

不知道我这解释是否能让楼主和各位童鞋理解。欢迎拍砖！

veryglad2cu

恩恩。。。同学，觉得你说的很有道理。为什么D不是从句啊。。。D不算是原因状语从句么。。。。

veryglad2cu

同学，问下你第二题。。。我不太懂。。。为什么now drawing会修饰adulthood呢？现在分词做定语，它的主语是句子主语啊。。。是N~而且为什么不可以理解为它是一个结果状语呢。

veryglad2cu

为什么会有时态混淆呢~~~~~now drawing不可以理解为一个结果状语么。。。