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 Safety in school has been of great concern because of frequent reports about accidents _______ students got injured or killed while in school .

    A. that        B. when      C. in which   D. for which

Safety in school has been of great concern because of frequent reports about

accidents          students got injured or killed while in school.      .

A. in which B. for which    C. which    D. when

 Safety in school has been of great concern because of frequent reports about accidents _______ students got injured or killed while in school .

    A. that        B. when      C. in which   D. for which

Safety in school has been of great concern because of frequent reports about accidents________students got injured or killed while in school.

A．in which　　 B．for which　　　 C．which　　 D．when

Safety in school has been of great concern because of frequent reports about accidents _______ students got injured or killed while in school .

　 A. that　　　 B. when　　 C. in which　 D. for which