问一道英语语法题~China's new food law provides for a food recall (召回) system ______ producers have to stop production if their food isn't up to standards.A.where B.that C.when D.which请说明原因~如果选that 的话，为什么where

问一道英语语法题~China's new food law provides for a food recall (召回) system ______ producers have to stop production if their food isn't up to standards.A.where B.that C.when D.which请说明原因~如果选that 的话，为什么where
问一道英语语法题~
China's new food law provides for a food recall (召回) system ______ producers have to stop production if their food isn't up to standards.
A.where B.that C.when D.which
请说明原因~
如果选that 的话，为什么where 不对？

问一道英语语法题~China's new food law provides for a food recall (召回) system ______ producers have to stop production if their food isn't up to standards.A.where B.that C.when D.which请说明原因~如果选that 的话，为什么where
选B,这是个同位语从句,后面producers.一直到结束是对food recall system 的说明
同位语从句只能用that引导,这里不是定语从句,注意
这是同位语从句啊,从句里 producers have to stop production if their food isn't up to standards,主语producers,谓语have to stop,宾语production,if后面是条件状语,一个句子主谓宾都有了,所以引导从句的词只能是一个在从句里不充当任何成分的词语,只有that可以
如果你硬要加where的话,我们只能理解成where在从句里充当地点状语,但事实上,你觉得“在这个召回系统里,假如.”这么说,通顺吗?什么叫在这个召回系统里?明显的逻辑不通啊,所以只能是that,从句也是同位语从句,that不充当任何成分
还有,同位语从句并不是只能以that引导的,whether,when,how,where等都可以,只是在这句话中,只能是that

where 引导定语从句并在从句中做地点状语(意义= in the system)，先行词是system

B.运用排除法。如果是一问就的话结尾符号会是？
但这是。A.C.D都有问的意思。结尾符号应该是？

C 召回系统启动的时候，产品将停止生产....

选A。考查定语从句。句意：中国新的食品法规定了食品召回制度，即如果食品达不到标准，生产者就必须停止生产。先行词为a food recall system，定语从句为producers have to stop production if their food isn’t up to standards (in the food recall system)，故选A。

B. that 为正确选项
这是一个同位语从句。“that producers have to stop production if their food isn't up to standards” 是 前面 “recall system” 的同位语，详细解析recall system 的内容。同位语从句有个特点，就是只能用that引导，且that不作从句的任何成分。
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B. that 为正确选项
这是一个同位语从句。“that producers have to stop production if their food isn't up to standards” 是 前面 “recall system” 的同位语，详细解析recall system 的内容。同位语从句有个特点，就是只能用that引导，且that不作从句的任何成分。
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b
因为句子结构完整
producers have to stop production if their food isn't up to standards是对a food recall (召回) system 的解释说明，是宾语从句

A
where 引导定语从句
where相当于in the system