求各位给个指教 og12—21/26/27 三个题

moneylee1441

og12-26
Emily Dickinson’s letters to Susan Huntington Dickinson
were written over a period beginning a few years before
Susan’s marriage to Emily’s brother and ending shortly
before Emily’s death in 1886, outnumbering her letters to
anyone else.
?? (B) Dickinson were written over a period that begins a few
years before Susan’s marriage to Emily’s brother and ended
shortly before Emily’s death in 1886, outnumber
?? (C) Dickinson, written over a period beginning a few years
before Susan’s marriage to Emily’s brother and that ends
shortly before Emily’s death in 1886 and outnumbering
?? (D) Dickinson, which were written over a period beginning a
few years before Susan’s marriage to Emily’s brother,
ending shortly before Emily’s death in 1886, and
outnumbering
?? (E) Dickinson, which were written over a period beginning a
few years before Susan’s marriage to Emily’s brother and
ending shortly before Emily’2s1 death in 1886, outnumber
请问A中outnumbering做分词为什么不能修饰letters，表示前面一句话的结果。
og上A的解释A :The long, wordy opening clause gives too much emphasis
to the period when Dickinson’s letters were written; it is
unclear what outnumbering refers to. 为什么outnumbering指代不清？

og12-27
Paleontologists believe that fragments of a primate
jawbone unearthed in Burma and estimated at 40 to
44 million years old provide evidence of a crucial step
along the evolutionary path that led to human beings.
?? (A) at 40 to 44 million years old provide evidence of
?? (B) as being 40 to 44 million years old provides
evidence of
?? (C) that it is 40 to 44 million years old provides
evidence of what was
?? (D) to be 40 to 44 million years old provide evidence of
?? (E) as 40 to 44 million years old provides evidence of
what was
C选中that it is怎么造成an ungrammatical sentence？
E选中 what was是wordy还是有语法错误?


og12-21
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 conclusions
about how the human brain grows and how babies acquire
language.
?? (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,
D，E中 over the past twenty years的位置表意有何不同?哪个更好呢？
D的og解释The final descriptor in present tense, now drawing conclusions
… does not fit the opening clause, which is in present-perfect
tense (have amassed a wealth …) and seems to modify adulthood.
为什么drawing不能当成分词修饰前面一句话用，修饰前面句子主语Neuroscientists？

fdrandom

没有排版，没有划线，怎么看。。。