一道从句题目Scientists are trying to develop a special material,__

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一道从句题目
Scientists are trying to develop a special material,______they will make use of in space.A.it B.one C.that D.what
您好,我看了之前您给他人的解答.关于which的解答能明白,但是one还是不清楚.用one指代a special material,然后选择one是因为省略了that的缘故吗?那that为什么可以省略?

这道题是应该选B的.关于定语从句要明白几点,那就是：1、which既可以引导限制性定语从句,也可以引导非限制性定语从句；而that只能引导限制性定语从句.2、which和that引导限制性定语从句时,做主语是不可以省略的,而作宾语时可以省略.明白了这两点,现在就来分析下这个句子吧,此句有个逗号,那么它要么是第一种情况非限制性定语从句,如果是非限制性定语从句,根据上面规则就只能填which；第二种情况是,在主句Scientists are trying to develop a special material后加个one替代a special material起同位语作用,此时______they will make use of in space这个句子已然是成了限制性定语从句了（因为one和they will make use of in space没有逗号了）,那么横线处可以填one that或one which 或one 这三种情况都可以,填one是因为that和which在从句中作宾语,可以省略.所以看下答案,就只能选B了,
总结：此题横线处填以下4种答案都可以,which,one which,one that,one

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