问题
选择题
| School safety has set off alarm bells with frequent serious accidents _____ students got injured or even killed. |
A. that B. in which C. by which D. when |
答案
答案：B
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| School safety has set off alarm bells with frequent serious accidents _____ students got injured or even killed. |
A. that B. in which C. by which D. when |
答案：B