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The teacher made ( ) her duty to care for lives and study of

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The teacher made ( ) her duty to care for lives and study of her students 填one?that?it?this?
填it .考的是it 的用法 ,这句里面 it代替的是后面to care for lives and study of her students .one表示泛指,that和it 表示特指.that与所指名词为同类,但不是同一个,而it 与所指名词为同一个.