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英语语法的3个问题 大师专家帮忙看下

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英语语法的3个问题 大师专家帮忙看下
1.The history of clinical nutrition or the study of the relationship between health and how the body takes in and utilizes food substances,can be divided into four distinct eras how引导的是什么从句?
英语语法的3个问题 大师专家帮忙看下
The history of clinical nutrition or the study of the relationship
between health and how the body takes in and utilizes food substances,
can be divided into four distinct eras:
the first began in the nineteenth century and extended into
the early twentieth century when it was recognized for the first time
(that food contained constituents that were essential for human function)
and
(that different foods provided different amounts of these essential agents).
第一个that和第三个that并列,都是主语从句.
第二个是定语从句.that是从句的主语.