老师说这个句子中的that为连词 可是and也是连词的啊,这两个连词怎么可能放一起呢?
老师说这个句子中的that为连词 可是and也是连词的啊,这两个连词怎么可能放一起呢?
and that different foods provided different amounts of these essential
agents.
完整的这段英文是
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.
其实for the first time后面的第一个that开始的句子就是代替前面的it was recognized for the first time中的it,第二个that were essential中的that是定于从句的引导词,先行词是constituents,至于and that中的that也是代替it was recognized for the first time中的it.
那么,这样说来,it was recognized for the first time中的it由两个that的句子所代替,因此要用and把两个句子串连在一起.
你们老师说that是连词,是对的,这时候的that是一个从属连词,是主语从句（题目中的是形式主语it）中的引导词,因此和你说的and（并列连词）同时间使用是没有冲突的.
再举个例子：（主语从句中的it作形式主语）
It is very difficult that he will pass the exam
翻译起来就是：
二十世纪第一次人们认为食物包含许多对人类功能所必须的成份,还有（人们也认为）不同食物提供了不同数量的这些成份.
希望帮到你,若有疑问及时追问,满意敬请采纳,O(∩_∩)O谢谢~~我理解了 可是我们老师从that different foods provided different amounts of these essential agents.这句话直接就说这that是主语引导的从句的关系连词，我不明白他怎么看书来的，就是因为句子成分完整么？你们老师错了，主语从句的that的内容有两个，一个是that food contained constituents that were essential for human function ； 另外一个是后面的that different foods provided different amounts of these essential agents.你回去告诉你老师吧，你老师老眼昏花了！告诉他是错的