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.
as a method of the extraction of minerals, it was well established
as a method of the extraction of minerals well established
was a well-established method of mineral extraction
was a well-established method of extracting mineral that was
had been a method of mineral extraction, well established
答案是B,请指教
偶先选C, 但后来觉得B反而对。
GMAT原则,不改原意的情况下选最好的。C 改变原意, 它把动词 establish 改成形容词 established, (this is wrong).
B应理解为:Leaching........as method..... established, but....miners did not realize.......
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.
as a method of the extraction of minerals, it was well established
as a method of the extraction of minerals well established
was a well-established method of mineral extraction
was a well-established method of extracting mineral that was
had been a method of mineral extraction, well established
答案是B,请指教
此题,我会选C
A、D不考虑了。
B除上述的错误外,还有一个:as a method of the extraction of minerals well established
E is wrong. In E, "well established" refers to mineral extraction rather than to "leaching", distorting the orginal meaning of the sentence.
So is D. The orginal meaning is leaching was as early as.....
B is obviously wrong! read it again. The first half of the sentence doesn't even have a vt. because "established" here should be passive --- was established.
E- Had been has no clear time frame. Perfect past tense has to have a clear time frame (from a point in the past to the point in the past). 不过最关键错是well established 扭曲句意。原句认为leaching is a well-established method ... as early as the 18th century. 不是 "the method was well established as early as 18th century" as E suggests. 就是说,不是18实际建成的,而是在18实际是比较完善的方法。
做的时候在C和E之间举棋不定。但最终否定C,a method as early as 18C不通的,a method established as early as 18C是可以的,中文译为“早在18世纪便建立的”,修饰动词。
当然,E的过去完成时给句子加了点意思,好像在引申no longer a method。但其他还是讲得通的:
Leaching, <appositive modifying "leaching">, had been a method of mineral extration, well established ... (appositive modifying "a method of mineral extration"), but ....
Using accounts of various ancient writers they used, scholars have painted a sketchy picture of the activities of an all-female cult that, perhaps as early as the sixth century B.C., worshipped a goddess known in Latin as Bona Dea, "the good goddess."
这里的perhaps as early as the sixth century B.C.,从语法上我分不清是修饰名词cult还是动词worshipped,不过我觉得从逻辑上来说,修饰cult更合适