英语语法问题（关于代词）one of the most important questions they had to consider was （）of public health 为什么填that?请详细详细详细说明理由ps ：that 引导的任何从句不充当任何成分么?我错了。。答案
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英语语法问题（关于代词）one of the most important questions they had to consider was （）of public health 为什么填that?请详细详细详细说明理由ps ：that 引导的任何从句不充当任何成分么?我错了。。答案
英语语法问题（关于代词）
one of the most important questions they had to consider was （）of public health
为什么填that?
请详细详细详细说明理由
ps ：that 引导的任何从句不充当任何成分么?
我错了。。答案不是that 是what
英语语法问题（关于代词）one of the most important questions they had to consider was （）of public health 为什么填that?请详细详细详细说明理由ps ：that 引导的任何从句不充当任何成分么?我错了。。答案
您好.这题that和what在语法上都没有错,只是意义上的区别.
一、
1）one of the most important questions they had to consider was （that）of public health
其中they had to consider 为定语从句,修饰先行词questions,省略了作宾语的关系代词（that、which）,即questions （that、which）they had to consider .
2）例句中的that,不是引导从句的,是代词,指代one question,
那么,这句话翻译为：他们不得不考虑的重要问题中的一个是：公共安全的问题
二、one of the most important questions they had to consider was （what）of public health
1）定语从句,好一一样,不再重述.
2）what=sth +that从句...这里的sth可以包括很多方面,
可以是具体的事物
如 what i need is a piece of bread=the thing that i need is a piece of bread.
还可以指代抽象的事物：
如：what i need is your love=the motion that i need is a piece of bread.
所以整句话翻译为： 他们不得不考虑的重要问题中的一个是：公共安全的各个方面.
希望能帮到您
that 可以充当表语的成分的，主 +系+ 表 结构was是系动词的嘛，后面that充当他的表语结构的
答案就是that. 等同于the question.为避免重复，才使用that.
that这里代指the most important questions