问题

Safety in school has been of great concern because of the frequent reports ________ students got injured or killed while in school. [ ]

A: that
B: when
C: which
D: what

正确答案是：

同类题型

Which would you like to visit, Shanghai Expo Garden or Beijing Bird Nest— ______. I prefer to enjoy the 2010 FIFA World Cup at home.

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It is well known ___ a person eats causeschanges in the body

______is that box—It’s white.