问题
选择题
Safety in school is of great concern because of the accidents ______ students got injured or killed. [ ]
A. in which
B. when
C. that
D. for which
答案
答案：A
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Safety in school is of great concern because of the accidents ______ students got injured or killed. [ ]
A. in which
B. when
C. that
D. for which
答案：A