马上考试了，请教几道gwd 语法题 谢谢

Q31:
Leaching, the recovery of copper from the drainage water of mines, as a method of the extraction of minerals, it was well established as early as the eighteenth century, but until about 25 years ago miners did not realize that bacteria take an active part in the process.
A. as a method of the extraction of minerals, it was well established
B. as a method of the extraction of minerals well established
C. was a well-established method of mineral extraction
D. was a well-established method of extracting mineral that was
E. had been a method of mineral extraction, well established]
这题选C


Q41:
In 1713, Alexander Pope began his translation of the Iliad, a work that, taking him seven years until completion, and that literary critic Samuel Johnson, Pope’s contemporary, pronounced the greatest translation in any language.
A. his translation of the Iliad, a work that, taking him seven years until completion, and that literary critic Samuel Johnson, Pope’s contemporary, pronounced
B. his translation of the Iliad, a work that took him seven years to complete and that literary critic Samuel Johnson, Pope’s contemporary, pronounced
C. his translation of the Iliad, a work that had taken seven years to complete and that literary critic Samuel Johnson, Pope’s contemporary, pronounced it as
D. translating the Iliad, a work that took seven years until completion and that literary critic Samuel Johnson, Pope’s contemporary, pronounced it as
E. translating the Iliad, a work that had taken seven years to complete and literary critic Samuel Johnson, Pope’s contemporary, pronounced it
  Answer: B    请问  pronounces 的主语是什么？那began 是谓语么？

Q16:
While digging in the Egyptian desert, huge fossil bones have been found by paleontologists, which appears to have been the second most massive dinosaur that ever lived.
A. huge fossil bones have been found by paleontologists, which appears to have been
B. huge fossil bones have been found by paleontologists, which appear to be from        
C. it appears that paleontologists have found huge fossil bones that are from
D. paleontologists have found huge fossil bones from what appears to be
E. paleontologists have found huge fossil bones, which are from what appear to be
答案是E ,我选D ?

还有一道逻辑题，

Editorial:
An arrest made by a Midville police officer is provisional until the officer has taken the suspect to the police station and the watch commander has officially approved the arrest.  Such approval is denied if the commander judges that the evidence on which the provisional arrest is based is insufficient.  A government efficiency expert has found that almost all provisional arrests meet standards for adequacy of evidence that watch commanders enforce.  The expert therefore recommends that the watch commander’s approval should no longer be required since the officers’ time spent obtaining approval is largely wasted.  This recommendation should be rejected as dangerous, however, since there is no assurance that the watch commanders’ standards will continue to be observed once approval is no longer required.
In the editorial, the two portions in boldface play which of the following roles?          
A. The first is a recommendation made by the editorial; the second acknowledges a potential objection against that recommendation.
B. The first is a proposal against which the editorial is directed; the second is a judgment reached by the editorial concerning that proposal.
C. The first provides evidence in support of a recommendation that the editorial supports; the second is the conclusion reached by the editorial.
D. The first is a position that the editorial challenges; the second is a judgment that was made in support of that challenged position.
E. The first is a recommendation that the editorial questions; the second provides evidence against that recommendation.
答案是B