His books are in the bookcase.变为一般疑问句是不是Are his books in the bookcase?为什么我这样写老师给我打叉?

His books are in the bookcase.变为一般疑问句是不是Are his books in the bookcase?为什么我这样写老师给我打叉?

题目
His books are in the bookcase.变为一般疑问句是不是Are his books in the bookcase?为什么我这样写老师给我打叉?
答案
你的句子是完全正确的,老师打错估计是改得太快,一时看错了
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