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OG语法，救命！

rukawa

OG12的SC,请各位亲帮我解析，小弟实在搞不明白！在此先拜谢各位童鞋，THX！

3.Although various eighteenth -and ninteenth-century American poets had professed an interest in Native American potery and had pretend to imitate Native American forms in their own works,until almost 1900,scholars and critics did not begin seriously to study traditional Native American potery in native languages.
(A) until almost 1900,scholars and critics did not begin seriously to study
(B) until almost 1900 scholars and critics had not begun seriously studying
(C) not until almost 1900 were scholars and critics to begin seriously to study
(D)it was not almost until 1900 when scholars and critics began to seriously study
(E)it was not until almost 1900 that scholar and critics seriously bagan studying
请NN给出各项错误解析，OG答案是E，我怎么也想不通，not until 强调句不是应该倒装吗？E选项的正确形式应该是it was not until almost 1900 that did scholar and critics seriously bagin studying吧？

7.As its sales of computer producers have surpassed those of measuring instruments,the company has become increasingly willing to compete for the mass market sales they would in the past have conceded to rivals.
(A) they would in the past have conceded to rivals.
(B) they would have conceded previously to their rivals.
(C)in the past they have been conceded previously to rivals.
(D)it previously would have conceded to rivals in the past
(E)it would in the past have conceded to rivals.
OG给出的答案是E，这道题的答案也只能是E，我只是想请教，that引导的限制性定语从句可以省略吗？E选项作定语修饰sales，应该是省略了关系代词that吧？

21.Neuroscientists,having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood,are now drawing solid conlusions about how the human brain grows and how babies acqurie language,
(A) Neuroscientists,having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood,are
(B)Neuroscientists,having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years,and are
(C)Neuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years,and are
(D)Neuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood,
(E)Neuroscientists have amassed , over the past twenty years ,a wealth of knowledge about the brain and its development from birth to adulthood,
请先帮小弟解释over the past twenty years这个介词短语，A选项放在knowledge后面，B选项放在adulthood后面，以及E选项作为插入语，这三种处置方式分别修饰的是什么？
D选项为什么前半句是现在完成时，后半句就不可以是动名词？动名词在这里不可以作伴随状语吗？

28.Building on civilizations that preceded them in coastal Peru,the Mochica developed their own elaborate society,based on cultivating such crops like corn and beans,the harvesting of fish and shellfish,and exploiting other wild and domestic resources.
(A) based on cultivating such crops like corn and beans,the harvesting of fish and shellfish,and exploiting
(B)based on the cultivation of such crops as corn and beans,the harvesting of fish and shellfish,and the exploition of
(C)and basing it on the cultivation of crops like corn and beans,harvesting fish and shellfish,and the exploiting of
(D)and they based it on their cultivation of crops such as corn and beans,the harvest of fish and shellfish,and exploiting
(E)and they based it on their cultivating such crops like corn and beans,their harvest of fish and shellfish,and they exploited
这个句子中based on引导的句子作什么成分？based on是和developed平行的谓语吗？若是这样，为什么没有and链接呢？若不是，又是做什么成分呢？

33Because an oversupply of computer chips has sent prices plunging,the manufacturer has announced that it will cut production by closing its factories for two days a month.
(A)Because an oversupply of computer chips has sent prices plunging,
(B)Because of plunging prices for computer chips,which is due to an oversupply,
(C)Because computer chips prices have been sent plunging,which resulted from an oversupply,
(D)Due to plunging computer chip prices from an oversupply,
(E)Due to an oversupply,with the result that computer chip prices have been sent plunging,
请问D选项哪个地方不合适？

47．Five fleding sea eagles left their nests in western Scotland this summer,bringing to 34 the number of wild birds successfully raised since teansplants from Norway began in 1975.
(A)bringing
(B)and brings
(C)and it brings
(D)and it brought
(E)and brought
OG给出的答案是A，没看懂解释，为什么呢？E选项有什么问题？

请好心童鞋，帅气哥哥漂亮姐姐们多多指教，谢谢哦！
PS：弱弱的问一句，如何添加附件？