(whether)this material can be used in our factory has not been studied yet 括号里为什么不能用that如题,
问题描述：
(whether)this material can be used in our factory has not been studied yet 括号里为什么不能用that
如题,
答
whether 表示疑问，意思是，此材料能否在我厂使用，尚未研究。而that 一般用于肯定句式，所以用于本句不恰当。
答
主语从句.whether有是否的意思,that引导主语从句,补充当句子成分,不翻译.