Because the diamond is the hardest naturally substance, it is used in industry for to cut, grinding and boring other hard materials.
这里c肯定是错的,但是我感觉b怎么也有点问题啊,naturally是副词,怎么可以修饰substance呢,难道是修饰hardest,但是因为hardest是最高级,所以naturally后置了么?望高人指点,谢谢大家.
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agree,however, we insist the rule adj+n ,like "adv+do+nouns" but not "do adv nouns".
I gusss here is a mistype.
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