Safety in school has be
en of great concern because of frequent reports about accidents _______ students got injured or killed while in school．
| A．in which | B．when |
| C．that | D．for which |
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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．in which | B．when |
| C．that | D．for which |
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