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is that his pencil case? are these your keys? yes, they are.
零基础英语thisthatit用法
小学初中英语语法|指示代词 this that 相信所有英语老师都有同感
this和that的区别.pptx [自动保存的]
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this is cat. that is cat.
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thisthatthesethose区分一张图搞定
英语语法this和that的用法
this和that的区别