问题补充：
The teacher asked more to prevent the students’ eyes from being injured.
A. to do
B. done
C. to be done
D. being done
答案：
A. to do
B. done
(答案→)C. to be done
D. being done
解析：由ask sb. to do sth.可知此处应用不定式。宾语与宾语补足语之间为被动关系，故用to be done。
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