>>新东方教师揭秘GMAT分数算法<<

>>2016GMAT暑假备考特辑<<

　　新东方网GMAT频道在此和大家分享GMAT语法练习题GWD-TN-1-41，希望对大家掌握GMAT语法有所帮助。

　　(GWD-TN-1-41) 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

　　点击查看北京新东方GMAT教师周谢慧和王燚为大家带来的详细解析

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