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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
答案是C
D选项解释是 that was修饰不清;而且as early as the eighteenth century时间状语无法做method的表语,应该使was变为助动词,后面加上一个过去分词作为谓语动词,如that was established as early as…。
想问一下,抛开as early as... 不能做表语这个错误,为什么说that was修饰不清呢?that was应该可以跳跃修饰前面的method of extracting mineral结构中的method吧?是因为相比C(不存在跳跃修饰)D更容易出现修饰不清的问题(that前有两个名词可被指代)吗?这个应该是一个相对性错误吧?
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