The teacher asked more __to prevent the students' eyes from

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The teacher asked more __to prevent the students' eyes from being injured
A.to do B.done C.to be done 为什么选C 为什么用被动到底如何区分主动被动,

句中 “more” 后边省略了具体的方法,即 The teacher asked more （measures）to be done to prevent the students' eyes from being injured 如果还不懂就追问,很乐意效劳!
再问：两个问题第一如何判断more 后有 measures 第二如何判断主动被动我有点搞不清措施被用来阻止我们近视，和措用来阻止我们近视我们近视。我感觉差不多实在分不清。跪求解答。。。。。。。。。。。。。。。。
再答：一，后边不一定非得是measures，我举那个词只是想说明在more后面省略了一个名词。二，当人（即动作的发出者）作主语时，就用主动：当措施（即动作的承受着）作主语是就用被动。“人”采取“措施”，人是主语，用主动；“措施”被“人”采用了，措施是主语，用被动。仔细体会！！！！！！
再问：是不是 to be done 修饰的是 measures。。。。。。
再答：对

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