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those of us who have a family history of heart disease shoul

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/15 04:06:57
those of us who have a family history of heart disease should make a yearly appointment with their doctors.those of us who are over fifty years old should get ---our -blood pressure checked regularly.为什么代词一个用 their一个用 our该怎样区分?在这两个句子中those是什么词性?求详解.
Their他们,our我们,those 这些.