The teacher asked more __to prevent the students' eyes from being injuredA.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,

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The teacher asked more __to prevent the students' eyes from being injuredA.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,
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,

The teacher asked more __to prevent the students' eyes from being injuredA.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!