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

正确答案是：

同类题型

We’re going to the Great Wall tomorrow. —_______.

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This naughty boy is really________,which makes his mother upset.[ ]

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.I remember putting the tape recorder in the corner, but what _______ it?