指复数为什么用that不用those呢
By the middle of the 20th century scientists believed they were well on the way to treating, preventing, or eradicating many of the deadly infectious diseases that had plagued humankind for centuries.
为什么句中用了 that 没有用 those 呢，指代的不是复数吗？
最佳答案 2018-10-26 10:06
你的句子中的 that 是关系代词，不是指示代词，它只有单数形式，没有复数形式。关系代词用于引导定语从句，不管它修饰的名词是单数还是复数，都用that，不能用those。又如：
She burst the chains that held her. 她挣脱了绑她的链条。
Please correct the items that have a star. 请改正带星号的条目。
He marked the sections that he wanted to delete. 他标出了要删除的部分。
All the biscuits that were sent were carefully weighed. 凡送来的饼干都仔细地称量。
这样用的关系代词 that 通常也可以改为 which。用作宾语时也可以省略（但用作主语时不能省略）
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其它 2 个回答
By the middle of the 20th century scientists believed they were well on the way to treating, preventing, or eradicating many of the deadly infectious diseases that had plagued humankind for centuries.
【翻译】到了20世纪中叶，科学家们认为，他们已经开始了治疗、预防或根除许多困扰人类几个世纪的致命的传染病。
be on the way to：字面意思“在...路上”，引申为“做某事已在进行中”，well 表示程度。
难道网友不知道引导定语从句的关系代词that 吗？ those 可以用作“指示代词”，指代复数名词，但这里不是“指示代词”的用法。
如果觉得我的回答对您有用，请随意打赏。你的支持将鼓励我继续创作！
By the middle of the 20th century scientists believed they were well on the way to treating, preventing, or eradicating many of the deadly infectious diseases that had plagued humankind for centuries.
为什么句中用了 that 没有用 those 呢，指代的不是复数吗？
【答】这里的 that 是关系代词，引导定语从句，所以不能用 those 。
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