问题
Safety in school has been of great concern because of the frequent reports ____ students got injured or killed while in school.
A:where
B:when
C:which
D:that
B:when
C:which
D:that
正确答案是：
同类题型
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I find difficult for Tom to reach that picture.He is a little short.
Sam ______ coins since he was eleven years old, and now he has hundreds of them.
___ do you go to see your grandparents?— Once a month. [ ]
I want to see my grandparents _____ 8 a.m. _____ this Sunday.[ ]