标题: 谢谢啦 [打印本页] 作者: LeannaChina 时间: 2011-3-16 18:40 标题: 谢谢啦 leaching, the recovery of copper from the drainage water of mines,________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. C was a well-established methord of mineral extration D was a well-established methord of extracting mineral that was \ 恩 答案是C 仅仅是因为C简洁吗~~还有哦~~不是一般动词好于名词吗????????作者: geegee 时间: 2011-3-16 18:50
that was 中的that可能指代mineral,不如c中的清楚。作者: LeannaChina 时间: 2011-3-16 22:20
o ~一语惊醒梦中人啊~~!!谢谢啦 加油