改正：They didn't know where the mouse (was/came) from.
解释：where the mouse___ from是主句谓语动词know的宾语,即为宾语从句.
宾语从句要求句子必须完整,但是很明显该从句缺少谓语动词,所以必须加上was或came.
固定短语：be/come from...,意思是“来自于...”.
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改错：They didn't know where the mouse from.
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